Maintenance & Technical > KX250 / KX125

How often rebuild?

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gowen:
You can measure by compression, but I try to veer away from that because I've seen 2 cases of pistons collapsing in the 125s due to excessive wear (30 hours) on the piston. He had great compression, rings were good, just the piston was warn out from over heating, over revved and just the normal things you usally do with a 125.

I'm pretty hard on my engines and I've never owned a stock 125 long before they hit the grinding block (144cc) and usally take about 5 hours back depending on how hard I run them during the season. Inspect it often if you are going to keep the piston there for awhile, it will develop hairline cracks around the wrist pin and so forth and you will never know by compression, it will nuke the motor (and I mean everything) if the piston comes to pieces.

hughes:
Good advise. Inspection is key.

mustangfury:
I usually inspect the piston, cylinder, etc. about every 5-10 hours.  I measure the Cylinder wear, check for scoring, check the ring end gap, the piston wear, the piston cylinder clearance, and the piston diameter.  If everything looks good, I just put the thing back together.  I was just wondering if there was an approximate time that things lasted before they need to be replaced, so I'm not inspecting or replacing things, that need to be, more or less than needed.

Thanks.

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