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1980 kawasaki ke125 engine noise and vibration
From what you describe it sounds like the big end bearings to me.
Gearbox problems tend to be slipping in and out of gear or difficulty selecting a gear. Be careful doing this but if you place the blade of a large screw driver against the engine casing and place your ear against the handle, you can use the screwdriver as a stethoscope and listen for engine noises. It may give you an indication where the noise is coming from. Get someone to hold the bike steady with the engine running as you put the blade of the screwdriver against the engine casing and the handle close to your ear. Watch out for the hot exhaust in particular. The longer the screwdriver the better. Do take care doing this but it's an old mechanics trick to trace noise problems.
Good luck, I hope you get it sorted.
Yes, there is a lighting coil that only powers the headlight when the engine is running, all other lights/indicators can be run off the battery when not running.
My 4-wheeler idles fine but misfires once you give it gas
I don't know if I can solve it but it sounds to me like you're not getting enough fuel. has it been sitting awhile or just start doing this randomly? If it's been sitting there's a pretty good chance you'll need to clean you carburetor. when gas sits in the bowl of your carburetor for too long it will get thick and smell almost like varnish. My Suzuki 250 4x4 had a similar misfire and cleaning the carb fixed mine.
Burned spark plug
burning to hot, change air filter. adjust mix on carb, tight in and 1 and 3/4 out
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