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87 XR250R Top End Options

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Looks like I got me some piston slap, gonna have the jug measured against the piston to be sure. Should I just go with the next oversize, or is there a better option for a little more grunt?

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The piston is the same from 86-04 so there are plenty of options. Most popular is probably 77mm.

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The piston is the same from 86-04 so there are plenty of options. Most popular is probably 77mm.

Will that 77 work with machine work to the jug, or do I need a big bore kit of some sort?

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