 Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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OP
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This post is for all with the pulsing vibration in second gear at about 25-30 mph. I think it's the change of tyre....... I've changed sprockets and chain and cush drive rubbers and it's still there. OK, an exhaustive search suggests that this often happens after a change of tyres... exactly the same symptoms....... Given there's no play or a roughness in the rear wheel bearing, I'd suggest that it's a sensitivity to a change of rear tyre. This seems to be the common factor in all such issues. Me, I changed from the factory Metzler Me 880's to the ' new,improved' 888's.Others seem to have similar issues after doing this. Might I therefore humbly suggest that this bike doesn't like these tyres? If anyone knows better, I'd appreciate hearing from them. I'll let it rest for now.....it's not in fact a big deal...just a minor irritation. If I get really peeved with it I'll change again.
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2007
Posts: 5,068 Likes: 1
Saddle Sore
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Saddle Sore
Joined: May 2007
Posts: 5,068 Likes: 1 |
I have that now as well, but mine is under medium throttle. Pull in the clutch and roll, and it's smooth as silk. Load up on the power and it levels out. Just about medium power and it has this irritating methodical surging. I feel your pain sir.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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A few people Ive seen posting about this on various sites all claim it started after a new tyre fitting...as did mine. Ditto to clutch pull in.... I've also heard someone claim it's a fuelling issue...but I just don't see how that could explain it.
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Mar 2005
Posts: 386
Adjunct
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Adjunct
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I had bridge stone on front and Dunlop on rear. Felt a vibration . when replaced rear put same make on front vibration went away.
I was so much older then, I am younger than that now (Wrote By Dylan Sung by the BYRDS,)
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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Learned Hand
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Posts: 1,174 Likes: 15 |
Starting from the beginning. What all have you done to this bike? List any and all mods or changes. If it did not have this problem and now does. It's got to be in there somewhere. Or the wrong combination of things.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
Posts: 1,193 Likes: 22
Learned Hand
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OK. Prior to tyre change, no problems. I'd already removed the air injectors and O2 sensors...putting the correct resistors in circuit to prevent the check light from showing up. Bike had run approx 1000 miles with these mods. Also had long tors fitted prior to any of that and the correct remap to adjust. Tyres had been Metzler me 880's which I was told were no longer being made....shop recommended me 888's as being their replacements. Rode into shop problem free, rode out with pulsing vibes.got home, chain now with a major tight spot. Checked rear sprocket.... Different readings at different points so maybe warped. Replaced chain sprockets and cush drive rubbers. So far, that's the score
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
Try Ceramic Balancing Beads, I was having balancing issues when I started doing Phat Tire conversions on Speedys and Americas. 200 mm rears and 140 mm fronts, works with Mags and Spoked Wheels. You need to get special stem valves for inner tubes. The best benefit is your tires stay balanced as your tire profile changes due to wearing in. Obviously, this will not fix drive train issues. They stress in Industrial Vibration Analysis training programs that all most all machines that spin have a RPM range where the vibration axis jumps up to an undesirable level, our problem lies with that they are referring to startup to attain a specific operational RPM, whereas we are striving for smoothness at variable RPMs. As far as ascertaining where the offending vibrations exactly come from, they have stick on, memorized, self powered sensors, readable by a laptop with the appropriate software installed. As suspension/alignment tuning shops do exist, they should offer a service such as this as well, I think they would make money and if I had a problem such as yours, they would be getting some of mine.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2007
Posts: 5,068 Likes: 1
Saddle Sore
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Saddle Sore
Joined: May 2007
Posts: 5,068 Likes: 1 |
so what would explain that coasting downhill at 65 or any speed is smooth ? can't be my tires.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
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Posts: 5,720 |
Quote:
so what would explain that coasting downhill at 65 or any speed is smooth ? can't be my tires.
I would assume that as well. It points toward the drive train and that under load, the vibration manifests itself. Something faulty or loose/too tight, out of alignment or balance.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2007
Posts: 5,068 Likes: 1
Saddle Sore
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Saddle Sore
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Posts: 5,068 Likes: 1 |
wonder if a worn chain could be the culpa ?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
Posts: 1,193 Likes: 22
Learned Hand
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OP
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I'm afraid not....I've changed everything in the drive line except wheel bearing( which felt fine). The common denominator in a lot of cases is the change of rear tyre......once you've eliminated chain, sprockets and cush rubbers..there's not a lot else to change. I did incidentally have a tight spot in the chain, courtesy of the ham fisted tyre fitting shop, but even now it's all new stuff back there the pulsing remains.
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
Posts: 1,193 Likes: 22
Learned Hand
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OP
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One further clue ...it definitely gets more pronounced as the miles go by...hardly noticeable on start up but more obvious after 20 miles or so. Really does feel like something's binding/ not quite rotating true.....I can't see anything to account for this and its driving me nuts!
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Dec 2006
Posts: 7,028 Likes: 8
New Tires
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New Tires
Joined: Dec 2006
Posts: 7,028 Likes: 8 |
Pulsing vibration....again, but I now know why....it's the reason chics are always asking for a ride.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jan 2005
Posts: 5,270 Likes: 17
Saddle Sore
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Saddle Sore
Joined: Jan 2005
Posts: 5,270 Likes: 17 |
Is your bike an America ? Have you made sure the spokes are trued
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
Posts: 1,193 Likes: 22
Learned Hand
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OP
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It's a 2014 America LT.(12000 miles...9 k of theses by me since last November) alloy wheels....no dings or obvious signs of running out of true. Does its trick only in 2nd gear 25-30 mph....more evident under load..This morning tried lugging it 25-30 in 3rd...no vibes. Tried screaming it up to 25-30 in first....no vibes.
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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Learned Hand
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since you have been all thru the drive train and it is not sorting out, it seems that (with what you changed out) it should be getting worse at higher speeds or that regardless of speed the the sensation should go with the engine rpms. and you are saying its neither.
localized to a speed range and engine speed. interesting. does it only feel buzzy? handlebars or foot pegs? whole bike. short or long frequency? lopey?
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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OP
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It's a buzz felt through the footboards ... regular, repeating till I'm through the speed/ gear combination. The fact that it's felt through the boards leads me to believe( wrongly?) That it's rear end drive train related rather than front wheel...again though, nothing obvious wrong front end either. Have to say that this is one of the most frustrating things I've experienced in nearly 50 years of riding. It's doubly annoying since I got rid of my HD Switchback recently because of even worse vibration after changing the rear tyre...though I managed in the end to trace and sort that one- the factory torque setting for one of the silencer mounting bolts was wrong. What depresses me is that this problem appears a number of times on the RAT forum with no apparent solution...the same very specific vibes at 25-30 in second gear after a tyre change....most folks end up selling the bike as a solution! I'd really rather not end up doing that. As I've said before,ideas and theories are most welcome.... I'm getting to the end of my own ones. Left to try A) tighten the drive chain....feels counter intuitive but it is slightly looser than the factory setting of 35-45 mm. B) Refit the O2 sensors and see if it's a weird fuel mapping issue..though it was fine prior to the tyre change C) murder someone( anyone/ tyre fitters especially) D) Suicide..nah, revert to C)
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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Learned Hand
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I had a low rythmthic vibration on my 2012 speedmaster after removing the emissions and adding scepter exhaust. i never changed the tires on that bike while I had it.
after lots of fooling with the chain. and being quite annoyed. it ended up being a tune issue. specifically an FL map switching issue. sort of the ECU looking at the wrong fuel map at the wrong throttle opening. So it made it hunt and surge slightly. giving the feel of a harmonic.
the dealer had originally thought a MAP hose issue, but that did not fix it. although you might check your MAP lines as they are easy to do. If leaking it would run for crap most of the time.
when you say you added a circuit to not get a engine code light, was that a plug into where the air pump went?
are the O2 sensors still attached to the wire harness? or did you plug optimizers into the sensor plugs?
have you or the deal plugged into the ECU to see if there are any error codes? THe MAP condition would show then as well. You could have masked a engine light with that add on bit.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
Posts: 1,193 Likes: 22
Learned Hand
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Yes, I plugged in a resistor to the ai harness connection when I removed the injectors.....and no, I removed the O2 sensors after running for a couple of weeks to see if the check light would come on.Again, I'd previously plugged in a couple of resistors to the wiring harness connectors for these as well. It's always possible that I simply didn't notice the pulsing vibes before the tyre change....though unlikely as I'm fairly fastidious about how my bike runs I've just had the dealer run a diagnostic check last week...all was well except of course that the O2 sensor no longer gives a variable reading as it isn't there.....so this showed up as a ' fail' on the test....but that's to be expected once the O2 sensors are removed isn't it? I'd done about 800-1000 miles with the sensors and ai removed without noticing any problems
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
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Quote:
It's a 2014 America LT.(12000 miles...9 k of theses by me since last November) alloy wheels....no dings or obvious signs of running out of true. Does its trick only in 2nd gear 25-30 mph....more evident under load..This morning tried lugging it 25-30 in 3rd...no vibes. Tried screaming it up to 25-30 in first....no vibes.
I'm no Hercule Poirot, but could there be something Wonky with 2nd Gear? Even robot gear cutters can make a mistake. A worn, missing or flawed bushing, needle bearing, spring, spacer, etc. could move the lash engagement out of spec under a specific load of just one gear setting. If you are under warranty, you might put them on notice that the trans needs an inspection by a qualified tech.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2007
Posts: 5,068 Likes: 1
Saddle Sore
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Saddle Sore
Joined: May 2007
Posts: 5,068 Likes: 1 |
Mine is a low frequency slow paint shaker sorta back and forth motion. Pull in the clutch and roll and it's gone. Crazy.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2007
Posts: 5,068 Likes: 1
Saddle Sore
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Saddle Sore
Joined: May 2007
Posts: 5,068 Likes: 1 |
Woah, one more post and I'm at 5,000
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jan 2008
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Learned Hand
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Learned Hand
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Quote:
Mine is a low frequency slow paint shaker sorta back and forth motion. Pull in the clutch and roll and it's gone. Crazy.
When you pull in the clutch do you also roll off the throttle? Or hold the throttle position the same as when you have the vibration?
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2012
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Adjunct
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Adjunct
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Have you checked ALL the engine mount bolts? Just because they were tight at one time doesn't mean they will stay tight. Any flexing of the engine will change the pressure of the chain on the drive sprocket. As soon as you remove the load on the sprocket the engine MAY be moving, just one more thing to check as you've already checked the obvious.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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OP
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Ah Ha! I may have found the culprit. Checking the rear tyre again this morning I found a fluctuating run-out on the drive side tyre shoulder....just where the sidewall meets the tread....... Rode back to the shop and harangued them politely.( Hey, I'm British). BUT...though they agree the run-out is there they tell me the tyre needs to be sent back to Metzler for them to decide if I have a warranty claim. Could take weeks. Meanwhile I either leave the bike with the shop or put a new tyre on it and hope the factory cough up. Reluctantly asked them to order me up another 888 but I'm not sure now whether I just shouldn't cut my losses, try to find another 880 and fit it myself. But, hey, it's progress of a sort. Meantime I'll check UK consumer legislation to see if, as I suspect, I have a claim against the shop as a supplier rather than against the maker.
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
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If mine I'd go with a Michelin Commander II...
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2007
Posts: 5,068 Likes: 1
Saddle Sore
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Saddle Sore
Joined: May 2007
Posts: 5,068 Likes: 1 |
Quote:
Quote:
Mine is a low frequency slow paint shaker sorta back and forth motion. Pull in the clutch and roll and it's gone. Crazy.
When you pull in the clutch do you also roll off the throttle? Or hold the throttle position the same as when you have the vibration?
No, have not. Just rolling at idle. will try some RPM's next time out to rule out or include engine.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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OP
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Quote:
If mine I'd go with a Michelin Commander II...
That's an option too.......
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Sep 2015
Posts: 797 Likes: 17
3/4 Throttle
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3/4 Throttle
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Mine has always done this also. I tore the whole drive train a part last year. New tires, Shocks, brakes,19 tooth sprocket. I finally decided it is engine harmonics and just don't worry about it. Does it in that exact range and second gear is definitely.
Don't ask me what engine harmonics means. Just the best way I can describe it.
Road Rash Heals. Freckles Grow Back. Ride
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2007
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Saddle Sore
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Saddle Sore
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Posts: 5,068 Likes: 1 |
Quote:
Don't ask me what engine harmonics means. Just the best way I can describe it.
I wont. But back in the Depression days, them folks that drive the train would get bored after tossin' wood in the boiler, so's they would sing railroad songs and play a harmonica. So there you go.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
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Posts: 5,720 |
Best definition I could find to explain Harmonics and the resultant vibration, Doo-Dah Doo-Dah http://azimadli.com/vibman/whatisvibration.htmIt affects everything from Lawnmowers to Hyper-sonic Guided Missiles.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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OP
Learned Hand
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Quote:
Mine has always done this also. I tore the whole drive train a part last year. New tires, Shocks, brakes,19 tooth sprocket. I finally decided it is engine harmonics and just don't worry about it. Does it in that exact range and second gear is definitely.
Don't ask me what engine harmonics means. Just the best way I can describe it.
I'd go along with this except it didn't do it before the tyre change and did it immediately after it. Ordered a new tyre today....will fit it myself this time and see if it does the trick
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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Learned Hand
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Quote:
Quote:
Mine has always done this also. I tore the whole drive train a part last year. New tires, Shocks, brakes,19 tooth sprocket. I finally decided it is engine harmonics and just don't worry about it. Does it in that exact range and second gear is definitely.
Don't ask me what engine harmonics means. Just the best way I can describe it.
I'd go along with this except it didn't do it before the tyre change and did it immediately after it. Ordered a new tyre today....will fit it myself this time and see if it does the trick
Just for phucks sake, Put the old tire on backwards and ride a bit, see what happens.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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OP
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I expect the tank will fill up with petrol
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
Posts: 1,193 Likes: 22
Learned Hand
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OP
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Whilst I'm waiting for my tyre to be delivered I thought I'd test out the fuelling hypothesis I've heard occasionally ...so I reconnected the O2 sensors and took a test ride. Nope, no difference and so far I've drawn the line at reconnecting the AI nonsense. Later today though I noticed as I came to a slow halt that I can feel a very slight shimmy through the handlebars.....by slow I mean at about 3 mph or less. This leaves me wondering if I've been barking up the wrong tyre. In my book such a shimmy suggests front end not rear may be the cause. Haven't got time today to check this out further but my plan is to A) loosen front pinch bolts, spindle and calliper retaining bolts then pump the forks a few times and retighten everything......in case they just were careless when they did the change of tyre in the shop. B) remove wheel and check balance, run out and out of round specs. Any other ideas gratefully received.
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
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I've found the preload on the stock fork/frame bearings sloppy loose on 5 of the 11 Triumph Cruisers I've owned since 2008. I set the preload with the tank off with a mag base dial indicator atop the spine setup 90 degrees to the top tree plate. With the front elevated pushing the forks from front to back registers actual runout. Zero runout as book recommends is too tight, .001" + - 00025" total read is as close to right as I've found. I set up the aftermarket bearings the same way.
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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Just had an interesting phone conversation with a friend of mine who runs a Victory Cross country. He's put a set of Metzler 888's on his bike and experienced the same problems with vibration.......and sent them back to Metzler. Anyone else running these tyres? I strongly suspect they are just not a good choice. I've ordered an 880 for the rear and will order one for the front and scrap the ones I've just bought. The 880's are now out of production but I can get them still. At least I know these will do the job
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Feb 2005
Posts: 20,096 Likes: 2
Fe Butt
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Fe Butt
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Alan, I've been reading your ongoing saga about this vibration issue of yours for quite some time now, and while I surely hope it is being caused by something as simple as the new found blemish you've discovered on your rear tire, I've been hesitant to suggest to you something I've believed for a while may be the cause of it, and especially because as you mentioned early on, you discovered after retrieving your bike and riding it home that the technicians had over-tightened your chain, and that you mentioned you never had this issue to contend with prior to that time.
My thought here being that the over-tightened chain just might have damaged and/or prematurely worn/stressed your output shaft carrier bearings a bit, as an over-tightened chain can occasionally lead to such a thing.
(...but as I said, hopefully it'll just be a case of that blemished tire you recently discovered being the culprit here...I do hope it turns out to be just that simple)
Yep! Just like a good Single Malt Scotch, you might call me "an acquired taste" TOO.(among the many OTHER things you may care to call me, of course)
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
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Learned Hand
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OP
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Hi Dwight Yes, that unpleasant possibility has indeed occurred to me as well. If all else fails I'll turn the engine upside down and take a look in there. At present I'm thinking that if the carrier bearing or output shaft has been bent then I'd be having problems in more than just one gear/ speed range. It could conceivably be a problem with the gear cog itself, but again why was this fine immediately prior to the tyre change and the problem evident immediately afterwards? Anyhow I'll track it down and kill it one way or another. Meantime, pour yourself a good single malt on my behalf. Al
I took the Road Less Travelled.
Now where the ****** am I?
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 Re: Pulsing vibration....again, but I now know why....
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Joined: Jun 2010
Posts: 1,193 Likes: 22
Learned Hand
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OP
Learned Hand
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Quote:
I've found the preload on the stock fork/frame bearings sloppy loose on 5 of the 11 Triumph Cruisers I've owned since 2008. I set the preload with the tank off with a mag base dial indicator atop the spine setup 90 degrees to the top tree plate. With the front elevated pushing the forks from front to back registers actual runout. Zero runout as book recommends is too tight, .001" + - 00025" total read is as close to right as I've found. I set up The aftermarket bearings the same way.
Sorry Ryk I meant to respond to your post earlier and got sidetracked. I've just had the bike serviced by what's definitely the UK' s most knowledgeable and well respected Triumph dealer ( Jack Lilley) Given they did the 12000 mile service, this includes a check on the steering head bearings. I know things sometimes get missed, but if I've ever trusted any shop, it's these folks. In the past they've gone way beyond ' going the extra mile ' in sorting things out.....with my Thunderbird LT , even though I wasn't a customer of theirs at the time, they rode it and wrote, for free, a report which persuaded the factory that it needed a free rebuild. Again though it will go on my list of possibilities if other avenues come to dead ends. Al
I took the Road Less Travelled.
Now where the ****** am I?
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