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I had cbr 954 out at the track this past weekend and bike ran awesome for first hr.After that bike started getting a stumble around 7k rpm and only when getting on the power hard.Any suggestions on what it could be?
 

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I had cbr 954 out at the track this past weekend and bike ran awesome for first hr.After that bike started getting a stumble around 7k rpm and only when getting on the power hard.Any suggestions on what it could be?

Fuel pressure regulator?
Charging system?
Servo motor?
 

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Discussion Starter #3
Charging system is fine,don't have a servo motor,will have to check FPR over the weekend,any other suggestions on what to check?
 

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Charging system is fine,don't have a servo motor,will have to check FPR over the weekend,any other suggestions on what to check?
Plugs, coils, injectors, wiring and check that the air filter isn't clogged. Probably it doesn't get fuel or something wrong with the spark. Have you checked the fault codes. Do you have the MIL light on because of the removed servo?
 

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Discussion Starter #5
Has new air filter,servo motor has plug so no fault codes come up.Will be draining fuel in tank in case it was bad fuel,will also check plugs and coils this weekend and see what comes up.Bike was running perfect just before it started doing it.
 
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