Maintenance & Technical > KX250 / KX125

crank noise

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BDI:

--- Quote from: mustangfury on June 06, 2010, 09:09:02 AM ---how do you check if the crank bearings are worn?  Can you check it when you rebuild the top end? also, if the crank bearings are worn, will that cause bigger problems if you continue to run the bike, say, till the next top end rebuild?

--- End quote ---
You can check the main bearings by removing the stator cover and putting a dial indicator on the end of the crank and check up down and side to play. To check the big end bearing you will have to remove the top end.

mustangfury:
how do you check the big end bearings with the top end removed?

maddoggy:
i noticed that same noise on my bike a couple years ago and finally determined it is the kips rattling.

Coop:

--- Quote from: mustangfury on June 07, 2010, 10:02:46 AM ---how do you check the big end bearings with the top end removed?

--- End quote ---

Grab the rod and try to push/pull it up and down. You can also measure side to side play, the spec is in the manaul for that.

Like maddoggy, I suspect it's noisy KIPS. My 125 had a complete rebuild this winter and the KIPS were also removed and spotless by the time I was done cleaning them and mine definitely make noise.

DoldGuy:
Mustang,
I assume this is on a 93 KX125? The center valve (power valve) develops wear & will cause a noise that varies with RPM. If that motor is fresh they make No noise as most have posted referring to the big K5.

DoldGuy

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