CRF80 hybrid ideas?

Ok so I like the size of the 80 as a play bike, but I was wondering what engine could I shoehorn in there to make it kill-yourself-fast lol I would love to squeeze a 150R motor in but I dunno if that would fit?

the PERFECT size im looking for is a CRF70 or KLX110 but the 80 still isnt that big...plus fitting a bigger engine in it would probally be easier than the 70...

Any other suggestions Im open to?

Any motor is going to require some fabrication, unless you put a CRF/XR100 in it, which is your best bet. Or put 14" - 12" wheels on the CRF150r.

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