HI everyone. My first visit to the Forum. It looks like there is a lot of good info here! My experience is mostly with British bikes and magnetos, so this problem has me puzzled.
I searched the old postings for opinions on what could be happening with my KH500, but no luck. It feels like it is misfiring without sounding like it is. There seems to be no change in the engine sound on accelerating or at steady speed, but there is a barely noticeable hesitation – feels like you gently tap the rear brake or you have an overly tight chain. This happens every couple of seconds and gets annoying, fast. As long as the engine is running it does this. Otherwise, the bike runs great. Pulls strongly, doesn’t bog down if I give full throttle, etc.
I have changed plugs, moved around plug leads, tried a couple of used coils, raised/lowered the needle, changed main jets up and down, cleaned and adjusted the carbs several times, but with no change to the sensation of hesitation. I have checked cylinder head temps after a ride with the center one is hotter than the outers, but not a big difference.
Does anyone have a suggestion? Is this a symptom of failed crankshaft seals?
Thanks in advance for your suggestions! Sam.
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