Maintenance & Technical > KX500 Original
Bottom end/Transmission issues
Hillclimb#42:
--- Quote from: mustangfury on May 17, 2010, 01:37:07 AM ---This question is for a 125.
When the engine on my bike is running, there is a tapping noise that comes from the crank area. It could be from the clutch or the transmission. I am not sure what it is. It does it when the bike is in neutral and in gear. The tapping increases with engine speed. It is a very light sounding tap but it is still there. Sometimes it is louder than others. The best way i could describe it would be to take and run the plastic handle of your toothbrush across the rollers on your chain fairly quickly. The noise is not coming from the cylinder. I don't know if this is normal transmission noise or if there is a problem.
There is no slipping in the clutch. I had the clutch apart about a year ago and everything in there looked like it was just out of the shop. The gears do not grind when shifting and the bike shifts very smoothly. there is no performance issues, i just want to be proactive on a possible future problem. I don't know if some bearing is wearing out or something.
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I had a ktm 105 making a noise like that. I was afraid I had a piston skirt noise or crank bearing problem. Turned out to be the factory rivots that held the big gear to the clutch basket. It was the loudest at a low idle.
mustangfury:
--- Quote from: cutting torch on May 17, 2010, 11:55:33 AM ---Does your kick idler gear still have a bushing in it? The '87 I got had lost it's bushing and the snap ring that retained it to the end of the output shaft. It did a bang-up job on the back of the clutch basket!
That's all I can think of that would make a very noticable racket. :?
torch
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How do i check to see if the bushing is still in there? What does it look like? Can you show me what it is with a parts diagram or picture?
--- Quote from: Hillclimb#42 on May 18, 2010, 12:47:07 AM ---
I had a ktm 105 making a noise like that. I was afraid I had a piston skirt noise or crank bearing problem. Turned out to be the factory rivots that held the big gear to the clutch basket. It was the loudest at a low idle.
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Was this a problem that you fixed or needed to fix, and if so, how do i check for it and fix it?
Thanks guys. I appreciate it.
Hillclimb#42:
Either way, you will have to pull the cover. It almost always tears the gasket, if you don't have an extra to throw on there. There is a white plastic collar that you should be able to see wrapped around the kick shaft. The rivots that I refer to are on the backside of the clutch basket. They hold the gear to the basket, which would pulling the whole basket. I would tyr to see if there is any play in it front to back rotation and in and out from the center case. I mean to say check for slop in the clutch basket. I'm not 100% sure you would be able to see the slack that makes a noise or not. I installed a hinson basket and new cushoins and the noise was gone. It took a long time to track it down. A owners manual is a must, if you are going to tear it down.
mustangfury:
I have a clymer manual on the bike, so i should be good as long as it does not require special tools or a press.
I had the cover off previously without tearing the gasket so I'll try to be careful.
What are the rivots rubbing against to make the noise?
greencannon:
Every KX bike I've had from 80cc to 500 has made "that noise" for the life of the bike.
Kawasaki 2 stroke motors sound like nuts and bolts jumbling inside when running perfectly normal. I'm sure some other KX or KDX owners can agree on that.
If there isn't any (out of spec) play in any of the major components and no performance issues, then run it hard...
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