Maintenance & Technical > KX500 Original

KX500 COMPRESSION LOSS

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monster malibu:
Hey guys, I just started riding the other day and noticed my bike was running kind of differently ( low on power at times). I came to a stop and my bike stalled and wouldn't start again. I felt the radiators and they were warm, I then felt the jug and It was smokin hot, but would still roll over. After setting for a few hours the bike rolled over real easy "by hand". I didn't think to check the coolant level before riding. I haven't had time check the compression yet. Can somone tell me what it should be at? I was thinking around 125lbs. would be ok to run on. Anybody run into this problem before? Bob.

Hillclimb#42:
 Plenty of times. Seen and done it. If you run it too lean or just run it forever or any mild catastrophe happens you lose compression. Usually the rings are toast. Hopefully you re lucky enough to be buying some rings and a piston plus the gaskets. You won't know until you pull it apart and inspect cylinder and ports. Quick check piston by pulling exhaust off and rotate around slowly with kicker. Inspect rings and piston skirt. Should look new, not like you were dragging it behind your truck down the interstate!!! If they look good, it could still be a hole in piston or somethin, you kinda are hoping for mild damage to rings. Should be tough to kick thru without standing on it. Jug would be very hot, anyways, but no kick compression has to be worn rings for one reason or another.

monster malibu:
 If the piston and jug looks ok will I be able to put a new ring on and go? Where do I order a piston and ring for my 87? I've checked Dennis Kirk, Rocky Mountain, MotoSport, and Bob's cycle supply for a new piston and ring for my 87 and they only list 88-up. Will the 88-up piston with two rings fit my 87?

BigGreenMachine:
88-04 piston kit will work in your 87.

fluffy:
try bike bandit for parts,also they give a discount for ama members

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