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I have an 1988 or 9 trx 250r cylinder head jug, its been ported and, ETC
But anyway the piston says 3.50 on the top, and the jug is in need of a bore.i know that this way be pushin the limit, but i was wondering how much more can i bore it out to,, WITHOUT re sleeving. THANKS.
 

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bore job

You take it up to 120 wisco piston, might start running hot and if you go aftermarket stay around 295 that way you can stay on pump gas with lots of pulling power just change the front motor gear up 1 tooth and you top speed will be around 90 mph fast.
 
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