Maintenance & Technical > KX500 Original

K5 vibrates real bad.

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dirkster:
just got my 1987 k5 back together yesterday. rebuilt engine, 87mm bore, full port and polish, vforce 2 reeds, fmf fatty pipe, new crank bearings. got the engine all broke in. rode the bike around some today and it ran like a dream pulled nice and hard, was surprisingly a smooth ride. then the bike just died on me so i checked the plug and didnt even spark so put a new one in and had spark but it was weak. got it started again and it vibrates like a sob now. trying to ride it is not a good idea hands just go numb after 2 minutes. checked all the motor mounts were tight and they were. could the vibration problem be from poor ignition timing or the weak spark? any ideas.   

umberto:
Have you checked the flywheel and ignition to see if everything is tight and in place?

dirkster:
just checked and it is solid. the timing was retarded so i set it back to the middle line it started easier but no change in the amount of vibration. might need to get the flywheel balanced didnt realy notice how small the flywheel was till now, dont even have to take it off to do the timing.

sandblaster:
Ah, you have the small size flywheel.
Great for getting your engine to wind up quicker.
I've been looking for one for a while..
I have the larger size flywheel and stator if you want to trade.

dirkster:
some more info here after the bike started to vibrate like a sob, higher rpms are not smooth at all the as in dosent run right, like a misfires. could preigniton or detonation be the problem? the fuel that i filled it up with today could have been the regular mix instead of premium. i'll drain the tank and get some 91 octane with some octane booster tomorrow and see if that helps.

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