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Discussion Starter · #1 ·
So Im looking for a top end kit for the 87 TRX250. The place Im looking at gives me the following choices:

ATV .010" (.25 mm) Top End Rebuild Kit for '87-89 Honda TRX 250R

ATV .020" (.5 mm) Top End Rebuild Kit for '87-89 Honda TRX 250R

ATV .040" (1 mm) Top End Rebuild Kit for '87-89 Honda TRX 250R

ATV Std Top End Rebuild Kit for '87-89 Honda TRX 250R

I've been looking through the owners manual and a service manual and I cant figure out what they're talking about.

Ideas?
 

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It depends on how much the cylinder needs to be bored. Those are overbore kits, but those won't fit yours, because they're for the 250R which is a 2-stroke racing quad.
 

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