How do I remove the piston from my 2003 YZ 125?

SOURCE: removing water pump impeller

you might have to split the case to get to the back side of the impeller.

SOURCE: 2003 yahama yz 125 radiator

Google " motorcycle salvage yamaha ". You should be able to find a good used radiator there.

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Ed

• 479 Answers
• Posted on Apr 26, 2009

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?

SOURCE: new piston break-in procedures for a yz 125 2

let the bike idle for the first min or so then give it a few quick burps on the throttle let it warm right up to operating temp then drive it go through the gears nice and easy first couple times after that you should be able to start opening it up and riding it like you normally would.

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