SOURCE: i'm getting a "creamy" oil coming out of the overflow
when oil becomes creamy or foamy it is a sighn that you are getting moisture in it. you must have water leaking into your oil. you should fix the problem soon because your oil will not work properly with an excess if moisture in it.
SOURCE: SEIZED PISTON
excessive piston clearance.really needed bore job with oversized piston,not just honed and rings.measure piston to cylinder clearance,check spcifications and verify
SOURCE: Can I bore My 2001 yz 125?
It would be best to take it into a shop and have the machinist check it out before buying any parts, he should be able to guesstimate the amount of over bore required if it is at all possible, once you have this information, you can source the nessessary parts.
some of these type of parts are non returnable, best to play it safe.
hope this is of some help.
Ed
SOURCE: I have a 95 yz 125 head and 98 yz 125 bottom end.
You have a 50/50 chance that they will work okay. All the mounting holes need to line up and the cooling holes as well. Get a head gasket for the '98 and see if all lines up. Will the exhaust pipe fit the '95?
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