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Post by royrid24 on Feb 25, 2018 11:47:33 GMT
Hi all, has anyone come across this problem before? I have a problem which has suddenly occurred on my 85 1FN! Bike has been fine, and revs through to rev limiter, without any problems. Suddenly for no apparent reason, it has started to only rev to 10400 rpm, and then hit a brick wall, as if rev limiter has kicked in!! Bike has been on dyno previously to set fuelling etc, and was running perfect with good horsepower and hitting rev limiter at around 11400. Went to do another run, and all of a sudden it decided to only rev to 10400, but strangely still producing the same horsepower and torque as it did at 11000 rpm!!! I have tried 3 different cdi boxes, replaced crank position sensors, replaced fuel pump, and tried 3 different sets of carbs, with the same jetting as previous, and even replaced the wiring loom in desperation! ANY IDEAS ANYONE?? The bike starts and runs perfectly, but has now lost almost 1000 rpm from the top end!
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Post by andrewed1 on Feb 27, 2018 0:42:25 GMT
Did you try a different rpm gauge. Ypur current one may be failing.
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Post by royrid24 on Feb 28, 2018 16:17:42 GMT
Hi, yes tried disconnecting tacho. Engine rpm corresponds with the dyno tacho, so not a false reading!!
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