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I am hoping one of you knowledgable people can answer this for me. I have a yfm200 moto 4 engine I want to put in an off road go kart. I would like to mount a sproket where the drive exits the case before the u joint so that I can get rid of drive shaft and make engine bay compact. To do this I would mount engine 90° to axle but would also need to tilt it forward 15° to account for the angle the drive exists rear of casing. Would that be ok? Would oil pump etc still work. Any advice greatly recieved.
Hi everyone! I have a 1986 yamaha moto4 200 that's been sitting for a while! Cleaned the carb, replaced engine oil, put fresh gas in it. Got it running and went for a ride! It was running great just a little backfire once in a while! I barely made it home on the way back and now the bike won't run at all since then! It will start if I give a little bit of throttle but dies instantly as soon as I let go off the throttle! And even if I try to rev it up it'll sound like its not getting enough gas.. it revs up a couple hundred rpm's and backfires through the carb.. it almost sounds as if I was trying to take off from zero in 5th gear! Nothing is seized though! I dissasembled the head and the piston and cylinder are fine! Rebuilt the carb, replaced the ignition source coil.. I don't know what to do anymore.. compression test shows 90 psi Specs are 128 psi but i'm not sure if I trust my compression tester.. any ideas? Thanks!!