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View Full Version : Estimate on a 06yfz?



yamaha06yfz450
12-09-2007, 02:30 AM
Doe's anyone have an idea what kind of hp I would be making on an 06yfz the only mods that I have done are port&polished head stock cams, bored carb to 41mm, velocity filter system, curtis sparks bigcore exhaust, stock bore and piston aswell running vp U-4 race gas. Also any idea's of what kinda gain I would get by switching out the stock piston to a 13.5 cp race piston thanks.