Stuttering acceleration

Mikey-D

Mikey-D

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Hey all,

I just got my bike back from the shop (in Ottawa), since I have no tools or place to work on it here. They replaced the air filter, oil and filter, spark plugs, synced the throttle bodies. I've been out the last two days, and have found that the bike is stuttering under acceleration. Seems to be fine at constant throttle, and the idle sounds a little rough (but that may be my imagination). I just graduated and haven't been able to find work, so taking it back in to a shop for diagnosis is pretty much out of the question right now. I hoping someone has some suggestion as to what may cause such a symptom, and then maybe I can find a way to fix it myself.

Forgot to mention that my suspicion is the throttle position sensor. It's not throwing any error codes, and I just sprayed it with some contact cleaner hoping that would resolve the issue. It didn't. Ideas, anyone??

Edit: Duh. sorry, 04 R6.
 
Last edited:
Sorry, I'm an idiot. 04 R6
 
let us know how you made out with this. thanks.
 
I have the same problem that I've been trying to diagnose for 2 years... if you find a solution let me know lol. I've heard dozens of theories as to why it could be this way. I wouldn't guess TPS though that wouldn't do that. This is an ignition issue. I thought it was filthy carbs so I took mine out and cleaned them and it still does the same thing. My next guess is that it's running lean and misfiring under heavy accel but haven't had a chance to test it out. I also changed the plugs when I cleaned the carbs so that wasnt it either. My next test is going to be to tape over one air duct and see if that solves the problem, I suggest you try that. If that fixes it, it probably running lean.
 
The problem persists after running some seafoam through it. I tried cleaning the TPS, and while that usually solves the issue, it was a no-go this time. Since it's a sealed part, however, the contact cleaner may just not have penetrated enough. She also died on me the other day (idle get really rough, then drops, the dies altogether). I've also thought that it may be the fuel-air ratio, though I'd imagine that'd be a symptom, not the root cause. I'm running out of ideas here.

I'm going to see if I can check some other sensors this weekend (temp sensor, atmospheric pressure) since the TPS is showing within spec in diag mode, if I can find a atmospheric pressure gauge somewhere.

Any other ways to check whether it's running lean/rich? Preferably definitive ways that don't cost me a lot of money. Could having just had it in for a throttle body sync have affected this? If it is running lean/rich, what are my options at that point?

Thanks, all!
 
grab starter fluid or wd-40 and spray it onto your vacuum lines while the bike is idling, one line at a time. If the revs go up then you're running lean and you have a vacuum leak.
 
read the condition of the spark plugs they will tell which cylinder is running rich or lean. does the bike run any better with the choke on to compensate a lean condition?
 
The bike is equipped with stick coils. Its very easy to not seat them properly. Also the TB on that machine are also hard to seat as there is very little clearance. If they are not seated right you can draw air in on Cyl 1 or cyl 4 creating a false lean condition which BTW will also mess up the TB sych that was just done
 
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