 Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Cutting out at wide open throttle. I can cruise up to any rpm but if I crack the throttle at 4500 or higher in any gear the bike starts to stumble, almost like a pre rev limiter feel.
She starts great, idles good ( a bit off cadence here and there at idle) pulls strong through all gears and generally runs strong.
I was thinking maybe some trash in the bowls sucking into the jet at hard acceleration. I went completely through the fuel system. Tore down the carbs, float level,etc all looks good. Drained the tank, freh gas, removed the pingle and found nothing other than a little grunge around the petcock screen. I do not have the little hidden fuel screen, removed that sucker years ago. Clean air filter. Vac caps are all new.
The pickup coil setting (0.8mm) was checked last year, reading on meter currently seems good. No recent changes, jetting changes, et.
I've tried swapping the following only to find the same results. Coils, plugs, plug wires, cdi. All connectors are good and tight. Good ground.
One thing I noticed over the years I seem to find myself adjusting the the idle alot, she's alwawys liked to idle around 1150-1200 but it seems to fluctuate either up or down a few 100rms over a days ride. Not sure what that is telling me.
I'm stumped and I'm sure I'm missing something but I have been very thorough chasing this gremlin over the last couple of weeks,
Any idea what I should be looking for that would cause the stumble?
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Re: Cutting out at WOT, 4500 +
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
Try unplugging your TPS. Hard son of a gun to unplug though.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Quote:
Try unplugging your TPS. Hard son of a gun to unplug though.
I tried that as well, same results.
I've tried that in the past as well and she runs like crap when unplugged.
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Re: Cutting out at WOT, 4500 +
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Joined: Mar 2007
Posts: 5,616
Check Pants
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Check Pants
Joined: Mar 2007
Posts: 5,616 |
I can't say for sure but I think I red somewhere (when I was reading up on the FCR carb tuning stuff) that in a situation like your it is running way rich at that moment when you crack the throttle.
The only issues I see in the above would be that it didn't don't before this season.
Didn't someone here recently have a similar issue... Cleaned the plugs and all was well,again! How do your plugs look?
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Quote:
I can't say for sure but I think I red somewhere (when I was reading up on the FCR carb tuning stuff) that in a situation like your it is running way rich at that moment when you crack the throttle.
The only issues I see in the above would be that it didn't don't before this season.
Didn't someone here recently have a similar issue... Cleaned the plugs and all was well,again! How do your plugs look?
Plugs are new, show slightly rich. Same settings as in the past
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Re: Cutting out at WOT, 4500 +
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Joined: Mar 2007
Posts: 5,616
Check Pants
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Check Pants
Joined: Mar 2007
Posts: 5,616 |
How s she jetted? Main? Pilot? Turns out? What do you have on the intake side? Pods, snorkel, etc...
Last edited by Zmilin; 05/13/2012 1:06 AM.
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Quote:
How s she jetted? Main? Pilot? Turns out? What do you have on the intake side? Pods, snorkel, etc...
Dynajet 128's,Dyna springs and needles. 45 Kelhian 2-1/2 truns. Uni filter and snorkel.TOR pipes. This is an 03 America.
I have this same identical set up on an 04 Speedy, except the Speedy does not have the snorkel. I got to thinking about that last night. Could the snorkel be the culprit even though it's been in place for some time?
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Re: Cutting out at WOT, 4500 +
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Joined: Mar 2007
Posts: 5,616
Check Pants
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Check Pants
Joined: Mar 2007
Posts: 5,616 |
It's easy enough to check. Try it and let us know.
This seems to be the season for crb issues... I don't think I have ever seen so many posts so close together at any time since I have been on here. Anyway...
What happens if you just roll on from 4500 instead of cracking it?
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Quote:
It's easy enough to check. Try it and let us know.
This seems to be the season for crb issues... I don't think I have ever seen so many posts so close together at any time since I have been on here. Anyway...
What happens if you just roll on from 4500 instead of cracking it?
No problem. I can cruise right up to 5000-6000 and she seems ok @ any rpm you just cannot crack it. I checked float levels with a clear tube attached to the bowl drain. Levels are slightly higher than the top of the bowl?
Raining like hell here this morning 
Last edited by mikemm03; 05/13/2012 7:51 AM.
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Re: Cutting out at WOT, 4500 +
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
...Levels are slightly higher than the top of the bowl...
That is good.
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 1,018
Learned Hand
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Learned Hand
Joined: Jan 2005
Posts: 1,018 |
Check your diaphrams on the top of your slides for pin holes
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Quote:
Check your diaphragms on the top of your slides for pin holes
pulled the tops off again, Inspected the diaphragms. Look to be in excellent condition, and as we know those suckers can be a rascal to get back into place. Left side was a pill.
Anywho what I did see was quite a bit of carbon deposits on the carb body and the slide. Cleaned all that up nice and purdy with some carb cleaner and removed the snorkel as mentioned earlier. Still pissing rain so it may be a while before another test ride,
fingers crossed, again 
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Welp ! Finally caught a break in the clouds this afternoon here in rainy East Tennessee. Took the moody red head out and blasted up and down the Interstate a couple runs. Woohoo, I think I finally got it. She ran like a scalded dog! I suppose it was carbon build up on the slides or the snorkel or a combination of both, anyway I'm happy, she's happy and I'm heading to Georgia Wednesday with my redhead  Thanks to all for the advice.
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Re: Cutting out at WOT, 4500 +
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Cutting out at WOT, 4500 +
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Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
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Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Another solution to add to the knowledge base. Now put the snorkel back in so we know it was the carbon 
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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Re: Cutting out at WOT, 4500 +
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Joined: Jan 2005
Posts: 5,271 Likes: 17
Saddle Sore
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OP
Saddle Sore
Joined: Jan 2005
Posts: 5,271 Likes: 17 |
Quote:
Another solution to add to the knowledge base. Now put the snorkel back in so we know it was the carbon
Ed, that's a project for another day I'm trying to get my unmentionables, and a tooth(plural)brush ready to head out to the GA Rally
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Re: Cutting out at WOT, 4500 +
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Joined: Mar 2008
Posts: 1,586 Likes: 1
Learned Hand
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Learned Hand
Joined: Mar 2008
Posts: 1,586 Likes: 1 |
Had a similuar issue once,turned out to be my tip over valve.
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Re: Cutting out at WOT, 4500 +
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
That carbon sounds more like a symptom of a problem, rather than a fix?
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