Athena big bore kit!? yfz450

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Apr 13, 2006 | 01:12 AM

Ds650RaCeR

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Athena big bore kit!? yfz450

anyone tried this kit out?! its like a 478cc kit! just the kit alone no porting w/out cam mod.. is supposed to bring around 50 ponies!?

Apr 13, 2006 | 11:28 AM

Ernie660R

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Athena big bore kit!? yfz450

Thats a lot of money for 50 hp. I would live it stock bore, CP 12.5:1 piston, polish and port the head. If you can swing it use the WR crank or the 06 YFZ crank. JMO

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