Question about 1999 Yamaha YZF 600 R thunder cat

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Power Loss at around 3000 rpm

My Bike has started to lose power at around 3000 rpm, this only happens when in gear and under load. As it reaches 3000rpm the revs very slowly build still. I have checked the pick up coil resistance and Ignition coil resistance all are ok. No fuel lines are trapped. Recently I have replaced fork springs/oil and had the front end off for access. The problem only started when I put the bike back together.

Yamaha Thundercat yzf 600 r. 1998

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  • jkpfamily Feb 25, 2009

    I have the same problem with the power dropping off at 3grand til 5 then the power is explosive from 5.5 to 10k. Will gummout work if its run through the gas tank? If not what is the best proceedure?



    Thanx Jerry p

  • bike service engineer Feb 25, 2013

    Weak spark plug.......check with another spark plug.if the probelm cleared.replace the spark plug..

  • joshua david gore Oct 09, 2013

    my bike was doing something similar but i had to re adjust the air fuel mixture screw . almost got it.

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Weak spark plug.......check with another spark plug.if the probelm cleared.replace the spark plug....

Posted on Feb 25, 2013

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Are the carbs balanced correctly and are you sure that all of the jets are clean. if not try it, it might work. sluggish throttle response is normally to do with the carbs.

Posted on Jan 01, 2009

  • andybarr1 Jan 01, 2009

    are the carbs balanced correctly and are you sure that all of the jets are clean. if not try it, it might work. sluggish throttle response is normally to do with the carbs.

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