Maintenance & Technical > KX250 / KX125
Main Bearing Repacement
jonny500:
sorry stang, the shift drum, try and leave it in you should be able to work round it if you use blocks of wood. i use an electric of air powered impact wrench to remove the bolt, thay are normaly very tight with thread lock on
mustangfury:
Here are pics of the guts.
How about getting the crank out of the right case half?
Stang
mustangfury:
more pics
jonny500:
if you put it on blocks of wood with the clutch side up. you should be able to tap it out, put a peice of wood over the crank shaft end so you dont bruse it and knock it with a hammer. if the wood splits get another piece. an extra pair of hands would be use full
Motorrad:
--- Quote from: mustangfury on September 19, 2010, 08:45:57 AM ---That's comforting to know that might be my only problem.
what were you using for trani fluid, ATF? Does it seize from simply too much oil?
The back of your piston looks like my last piston when i last did the top end. It had that little melted lip on the exhaust side. Mine was even more melted. It didn't seize or mess up the cylinder though. Those previous pics are of the same cylinder wall, no changes. I put in a plug one step hotter because I though that might help with the oil problem I was having. I went down the trail and it just quit. Being fairly new to dirt bikes, I thought it was from riding it hard and hotter. Once I rebuilt the top end, I realized that wasn't my problem, went to jetting, and now i am here. Learned a lot since then.
--- End quote ---
That is my 500 motor of course...
I was running Bel Ray Gearsaver....
The reason my main seal went...
was the Crank journal was actually sized small and no one caught it.. Odd as it looked perfect (no sign of wear or tampering...... (I bought it with a fresh motor).. so the main bearings actually were loose on the crank (didnt spin on the shaft) but could be installed and removed way too easy.... also guess what... the crank seal didnt seal properly because of thsi,,, bike got warm and started drinking oil...
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