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View Full Version : yfz450 big bores



01-22-2006, 05:02 PM
i have a yfz with a 508 max power ice cube cylinder 11:1 compression, with stock porting on the head and stock carb with a sparks big core pipe, a prodesign pro flow kit and a gytr jet kit with the ncvq needle, could you give an estimate on hp with a properly jetted quad. i know you have probably been asked these questions a million time so don't get mad at me for asking i am just curious because i see all of these stock 450's with high compression pistons hitting 50 hp easily.

Mobile Dyno
01-23-2006, 04:46 AM
I would say your close to 50 or just over it. I did a stock 05' yfz and with only a Rossier Eng. Pipe and dialed in I got 44 which is great. The reason I say close to 50 or just over is because the big bore kits add alot of Tq. The do give Hp but where they really shine is Tq. Where do you live?

01-23-2006, 04:53 AM
indiana, i also will be running this with knobbys, and tire balls

Mobile Dyno
01-23-2006, 04:54 AM
I would still say close to 50

01-23-2006, 05:07 AM
what kind of torque should i see and what is an average torque number???

Mobile Dyno
01-23-2006, 05:47 AM
sent you a pm