Maintenance & Technical > KX250 / KX125
Best way to go replacing a '01 bottom end
shrubitup:
--- Quote from: alward25 on August 11, 2015, 01:26:09 AM ---pro-x sells good bearings and seals. Would not buy any rod/piston from them, all wossner, all the time. I have pictures if you need to get a better idea why not to run a pro-x piston.
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Last I knew ProX was made by ART who makes OEM pistons.
shrubitup:
--- Quote from: Actionman on September 02, 2015, 02:14:22 AM ---Everyone will regale you with tales of how bad Namura pistons are, but as long as your cylinder is in spec the namura pistons are very good in my experience. One thing I do is take a piece of 1000-2000 grit sandpaper and smooth any rough edges around the skirt, intake window, and side pockets where the pin slides in. I do that on any piston I use to keep stress fractures from forming. May not make a difference but I do it anyway.
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Used many Namura "junk" pistons without one issue.
KXDINO:
I bought a kx250 01 off a guy , only wanted the frame etc , any way he was running it for so long with the big end worn the piston was kissing the head , had massive play , so the oem rod is a pretty strong unit to take that abuse . On another note them motors respond well to porting , there a fair bit you can do to them.
Foxx4Beaver:
--- Quote from: KXDINO on September 18, 2015, 08:39:16 AM ---On another note them motors respond well to porting , there a fair bit you can do to them.
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+1
all I did was clean up the casting flaws on my '00...it has more low and mid range than my brand new '04 did.
needsatopend:
Ok here's where I'm at.
Got the crank back balanced with pro-x rod kit installed, and installed with new main bearings and seals.
Also the crack welded...
Installed the transmission tonight. Going to make a thread adapter for the case puller to install the left case half
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