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Discussion Starter · #1 ·
I have a 1999 CBR 900 RR, It has 24,000 miles on it, engine rebuilt 10,000K ago, Stage 3 jet kit. I just started a new job which has me riding 42mi each way, in the past 2 days I've noticed it has been stuttering alittle on its own at a constant speed or when i let off and re-apply throttle, I'm hoping its a light blockage that could be solved with using seafoam, also (shame on me) I've been using Mid-Grade fuel, Hope someone out there has some good news so I don't get stuck on the side of the rode, Thanks
 

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Discussion Starter · #3 ·
Its something new, but it does have an erratic idle, but it does have stage 3 jets. I'm not sure if its vacuum synced correctly. I've been wondering if its due to me removing all the fairings (damaged at a drag strip by previous owners, started to crack even more). I tried to test my theory by drafting a large pickup truck, the bike smoothed out immediately. I think it might increased air flow throwing off the fuel/air ratio. Its most common in high wind, and speeds of 65mph and above, once I twist the throttle more smooths out till i come to a steady constant speed
 

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Too much air is a good thing. Every single performance upgrade out there is designed to do one single thing...get more air into/out of your engine. If you're getting more air than you were, just compensate with more fuel. Plug checks are your best friend here (unless you have a wideband with datalogging capability). Adjust needle til you get smooth acceleration during a roll-on then run it up to redline and shut off engine while pulling in clutch. Pull a plug after coming to a stop and check. If you're running pump gas, should be a very light brown/tan color to plugs. If you really are getting more air to intake, plugs will look almost like they did out of the box.
 
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