Maintenance & Technical > KX250 / KX125
Piston skirt broke
samandson:
My engine seized in fifth gear w.o.t.!The skirt has broken off the exhaust side. It looks like time to bore a little of the stock size steel sleeve. My question is there a best size to go with? Forgot to mention that it is a 98 kx 250.
KXDINO:
The best size is up to the guy who will rebore it , minimal size to clean it up , but you need to work out why it seized , most likely to small a main jet while it was w.o.t. in top gear , another thing is to replace top ends more often especially if there worked hard.
68Fastback:
Ditto above, the bore size of the new piston will be determined by the machine shop and how much of the cylinder they need to remove.
samandson:
Thanks for the information. I had a158 main jet in. The guy at the machine shop said to send a piston with the jug.Can a forged piston be used in a sleeve?
KXDINO:
Go wossner on the piston if they make one for it , i say they would , 158 main jet is std size if your doing heavy sand work or holding it nailed on fire roads , go up a couple of sizes , you might help to gear it up a bit may be.
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