bored out 600?

what is the biggest size i can bore out a 1991 xr600?

You can bore it into oblivion but I think you can only buy .080 over pistons for the stock sleeve.

Try a thumper Racing 660 kit with a new sleeve installed.

As they say.....go big or go home.

When it comes to going with one of the big bore kits you need to consider the point of diminishing returns. Im not talking about perfomance but reliability. The XR600 loses it's reliability when you go too far as does just about any bike.

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