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I've got an '86 250 Rebel. Is there a way to boost it up to 300 without blowing the engine up?
 

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nope
 

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I'm sure there is a maximum overbore possible, but the gain per dollar amount would be prohibitive.

These engines originated as a 185, went up to 200, then finally up to 250. If Honda didn't make them larger than that there must be an engineering reason or a reliability threshold.
 
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