 cuts out at 65
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Joined: Oct 2007
Posts: 1,160
Learned Hand
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OP
Learned Hand
Joined: Oct 2007
Posts: 1,160 |
Ok so my dads america cuts out at 65-70. The problem is jetting If I pull the choke no problems at all. So how do I fix this
A. larger main jet
B. larger pilot jet
C. shim the neddle
D. screw with air fuel mix screws
Ok what do you guys thing ready and go!
Life need a little Triumph!
2008 Triumph Speedmaster, Single baffle drag pipes, lots of black powder coatin,K&N pods, AI removed, TBS needles and a procom cdi.
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Re: cuts out at 65
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
Since 65 mph is less than half throttle, or should be, I would start with shimming the needles. Did it used to be okay, and now it's wonky? Just wondering.
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Re: cuts out at 65
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Joined: Apr 2007
Posts: 3,061 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,061 Likes: 8 |
Need to know what the current setup is.
1. What exhaust system do you have
2. Has the intake been modified? Pods, snorkels removed, etc
3. Has anyone ever played with the carbs?
Need to know because if the bike is stock and nothing was ever done to it and you are having this problem, then find the problem before changing parts.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: cuts out at 65
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Joined: Oct 2007
Posts: 1,160
Learned Hand
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OP
Learned Hand
Joined: Oct 2007
Posts: 1,160 |
Quote:
Since 65 mph is less than half throttle, or should be, I would start with shimming the needles. Did it used to be okay, and now it's wonky? Just wondering.
It has always been kinda funny
Life need a little Triumph!
2008 Triumph Speedmaster, Single baffle drag pipes, lots of black powder coatin,K&N pods, AI removed, TBS needles and a procom cdi.
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Re: cuts out at 65
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Joined: Oct 2007
Posts: 1,160
Learned Hand
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OP
Learned Hand
Joined: Oct 2007
Posts: 1,160 |
Quote:
Need to know what the current setup is.
1. What exhaust system do you have
2. Has the intake been modified? Pods, snorkels removed, etc
3. Has anyone ever played with the carbs?
Need to know because if the bike is stock and nothing was ever done to it and you are having this problem, then find the problem before changing parts.
The exhaust is a home made stock pipe that we have rebaffled
I has a uni with snorkal removed
The carbs have been rejeted and messed with long before I have got it.
Life need a little Triumph!
2008 Triumph Speedmaster, Single baffle drag pipes, lots of black powder coatin,K&N pods, AI removed, TBS needles and a procom cdi.
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Re: cuts out at 65
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Joined: Jan 2006
Posts: 7,689 Likes: 21
Monkey Butt
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Monkey Butt
Joined: Jan 2006
Posts: 7,689 Likes: 21 |
In lower gears that means it should be falling on its face too. Try running 3rd out, see how far the throttle goes.
Sounds like you are running out of gas.
Sounds like the carbs in need of a rebuild.
(or fuel filter is gunking up)
I try to aggravate one person a day. Today may be your day.
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Re: cuts out at 65
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Joined: Oct 2007
Posts: 1,160
Learned Hand
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OP
Learned Hand
Joined: Oct 2007
Posts: 1,160 |
yep running out of gas because It is jetted wrong I just need to know which one to switch. Filter is not plugged it runs fine with choke pulled.
Life need a little Triumph!
2008 Triumph Speedmaster, Single baffle drag pipes, lots of black powder coatin,K&N pods, AI removed, TBS needles and a procom cdi.
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Re: cuts out at 65
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
In the words of Dinqua, it is not MPH or RPM, it is throttle position, now and always.
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Re: cuts out at 65
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Joined: Oct 2007
Posts: 1,160
Learned Hand
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OP
Learned Hand
Joined: Oct 2007
Posts: 1,160 |
I have never had it happen in any other gear.
Life need a little Triumph!
2008 Triumph Speedmaster, Single baffle drag pipes, lots of black powder coatin,K&N pods, AI removed, TBS needles and a procom cdi.
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Re: cuts out at 65
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Joined: Jan 2006
Posts: 7,689 Likes: 21
Monkey Butt
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Monkey Butt
Joined: Jan 2006
Posts: 7,689 Likes: 21 |
Quote:
yep running out of gas because It is jetted wrong I just need to know which one to switch. Filter is not plugged it runs fine with choke pulled.
Increase the primary jets not the pilots.
I would throw away the exhaust pipe immediately. I think that is a real suspect in all of this.
I try to aggravate one person a day. Today may be your day.
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Re: cuts out at 65
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Joined: Feb 2012
Posts: 544
Adjunct
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Adjunct
Joined: Feb 2012
Posts: 544 |
Just go fat. Should be in the 140s somewhere, and I'd go two slow jets up from stock. You can scrape carbon off, Can't fix a hole in a piston.
I have two into one baffled, stainless exhaust with knn pods. I'm running 48 slow 155 mains at 500ft and no real humidity... and it climbs up to 4000 feet everyweekend well. No flat spots no real popping on deceleration (after upping the idle jets) just as a reference.
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Re: cuts out at 65
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Joined: Apr 2007
Posts: 3,061 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,061 Likes: 8 |
I would start with 135 main jets, 42 pilots and throw a couple of shims under the needles if they are stock. Better yet, get a couple of needles out of the older Triumph Thunderbire (TBS needles) and use those or the needles out of a Thruxton.
Pull the float bowls off and see if you can tell what jets you have in place. Since it's always run funny, I bet the bike was never jetted properly.
One way to see if the bike is lean, throw the main snorkel back into the airbox and see if the problem goes away.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: cuts out at 65
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Joined: Sep 2010
Posts: 8,393 Likes: 1
Second Wind
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Second Wind
Joined: Sep 2010
Posts: 8,393 Likes: 1 |
Could be anything from float level adjustment to jetting and needles or even the fuel filter . More details required to diagnose. Could even be a lump of varnish (solidified gas residue) on the needles.
Last edited by locopony; 08/31/2014 1:20 PM.
I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago.
Edgar Allan Poe
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Re: cuts out at 65
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Joined: Oct 2007
Posts: 1,160
Learned Hand
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OP
Learned Hand
Joined: Oct 2007
Posts: 1,160 |
I got to my dads bike today I thought I had needle shims but I didn't. I did how ever have 135 jets so I took out the 132's and put in the 135's and took it for a nice test ride and it didn't hesitate once thanks for the help guys.
Life need a little Triumph!
2008 Triumph Speedmaster, Single baffle drag pipes, lots of black powder coatin,K&N pods, AI removed, TBS needles and a procom cdi.
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