Question about Yamaha YZ 125 Motorcycles
87 yz 125t. bored .30" over. need 56.75mm piston but wiseco doesn't make them anymore.
Yea, for most bikes they only come in .020 increments now. if your looking to freshen up the top end, then youll have to go to a 56.00mm piston. there will be almost no change in displacement or jetting from 55 to 56mm. if your replacing the piston, its best to have your cylinder bored anyways. since the worn cylinder walls may have adverse effects on the new piston rings, and they may wear a bit prematurely. a bore only costs about 30-40 bucks most places, and its cheap insurance. plus you will have the peace of mind knowing that your bore is matched specifically for your piston. I would definitely recommend a fresh bore.
Posted on Aug 03, 2009
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Posted on Jan 02, 2017
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