Having motorbike trouble, mechanics lend me your ears...?

  • Thread starter Thread starter bruvvamoff
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bruvvamoff

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I have a CBR600FW and when I bought it the guy had taken off the air filter and box, and put a racing exhaust on it. I dont know what other modifications he could have done. Anyway, we put the original exhaust back on and just fitted an airbox with K&N air filter and it starts and ticks over fine and runs fine up to about 3 thousand revs and then it kangaroos (stop and start) and it stalled at one point. I checked and there is fuel in the tank. The fuel feed must be ok coz it ticks over and revs fine when stationary. I have a theory that the guy who modified it has put big jets on the carbs to give better air/fuel mixture. Would this explain whats happening? How can I fix it? Thanks for your time.
The bike is 1998
 
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