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Zirbel Racing

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I recently rebuilt my quad. I used a wiseco hi compression piston, had the head ported and polished added a yoshimura slip on pipe, uni drop in air filter and rejetted it. Does anybody have a clue how much hp these few mods added?
LEOGM5150

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Reply with quote  #2 
hello and welcome to the site.

the pipe filter and jetting along with a high comp piston should be good for 3 to 8 hp depending on how close it is tuned and which pipe makes more power and where in the rpms. head porting can add or lose hp and on the predator depending on how much they ported it. usually it loses a few hp as the stock porting is good for a huge big bore and porting does not net gains very often on the fuji 500 engine until a big bore and huge lift and duration cams and much higher revs are being added also. assuming that the porting was more of a casting clean up and all other mods and matched and tuned perfectly. you could likely have added a good 5 hp. would put it at 47 hp to the crank and about 39 at the rear wheels like on a dyno. stock is 42 at the crank and about 34 at the rear wheels. all depending on who's dyno was used.

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