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Stumble 3000-4000rpms

Old 04-28-2006, 02:52 PM
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Join Date: Jul 2005
Location: Utah
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Stumble 3000-4000rpms

2002 SH Red because its the fastest SH. Anyhow, there is a stumble when riding the bike at 3000-4000rpms. Its more of an on/off pull/lag. I thought it might be a warped chain, but I just replaced the chain and adjusted it, also installed new sprockets. The problem is still there.

I think I remember reading something about the SH having a carb tuning issue at this rpm range, but the bike didnt do this last year.

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Old 04-29-2006, 09:27 AM
Join Date: Mar 2005
Location: Portland ORegon
Posts: 43
Re: Stumble 3000-4000rpms

It's likely to be what has been decribed variedly and experienced by almost everyone who started modifying their rides, and has been called hesitation, backfiring, burping, misfiring, etc. There's another recent post a little further down about carb backfiring that is likely a similar issue. In my opinion all bikes are different but it's likely a jetting issue and can also simply be a maintenance issue. Aftermarket exhaust-cans probably make your bike sensitive to slight changes (weather, dirt, gas) and could result in things like running lean in the mid-range.

Someone recently suggested searching this site for posts about rasing your needles, mid-range jetting etc. It's been discussed extensively here and you'll get lots of ideas, there are some very knowledgeable folks.

Make sure your air filter and pathways are good, your carbs are synched and clean. It should minimize the problem.

PS Leave your TPS alone.
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