New to thumper talk

Hey I have a few questions concerning an 02 yz426f. Mine has grenaded and needs a cylinder head, cylinder, crank, etc I already have a bunch in the bike to hey it ready so I was wondering if I could could convert it to a 450 if I do both the cylinder and the head.

Welcome to TT! 

I'm sure someone will answer you here but the best place to post this would be in the Yamaha-specific 4t sub forum.

Fixing your bike would take a lot of money, probably more than the bike is worth even in perfect condition.  But if you do the work yourself and the bike fits like a comfortable old shoe, go for it.

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