stroked/big bore 450

im wondering if anyone has stroked a 03/05 yz450f with a athena 478cc bore kit and if youve had any problems.

Stroked or Bored???

thinking of doing both at the same time or any problems with either on their own would be good advice

there is a nice article in last months Dirt Bike comparing both seperately and together :thumbsup:

Athena quote a 2 hp gain with that big bore, is it worth the $$$.

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