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Discussion Starter · #1 ·
I have a 98 cbr900rr, and now the engine will not rev past 8000rpm.

When it reaches this, the revs drop and then go back up, not to 8000rpm though.

Without the standard airbox on, there seems to be splash back from the carbs.

The engine is in a car setup, running a fuel pump, but everything else is standard
 

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Air, Fuel and spark. And all in the proper ratio at the right time.

My first guess would be inadequate fuel. My 2006 1000RR (fuel injected) bike behaved like this and I discovered that someone had put a 600rr pump in the tank. Once that was swapped out for the higher output pump, she performed like a dream.
 

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Discussion Starter · #3 ·
Sorry, the issue was that the airbox wasn't on.

I know I have read that removing the airbox on these engine can be a problem. But wasn't sure why stationery it would cause this side effect.
 
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