does anyone know the H.P on a stock yfz

 

Depends on the dyno. Some are more generous than others. The only one I've seen so far dynoed 29RWHP with a Yoshi pipe on KENZ dyno.

 

I'm pretty sure it's in the low 40s... maybe mid 40s. I do know that it makes less power than the YZ 450F and a little less than a stock WR 450F. Take the baffle out and it adds a couple ponys without even rejetting. After a good pipe, K&N w/o lid, jetting, and exhaust cam you'll easily be in the mid to upper 50s.

 

Those numbers would be on a VERY generous dyno.

 

No way!! Dude, do you know what stock YZ 450Fs are making? That motor is a powerhouse. It was designed to be. Like all of Yamaha's machines, they have to choke them up to get through their legal crap. The WR 450F stock is making around 50 and it takes a lot of choking to get that motor down to even the low 40s. There's no way that the YFZ is in the 29 range as you say. Incase you didn't know, the YFZ motor is the WR motor with differnt tranny ratios (obviously).

 

RAPTORAZ, let me ask you a better question. How much hp do you think your EX is making?

 

40+ HP stock....hahahahaah. are you high???

they are right around 35-36hp.

 

yep.. ive seen 35-36 quite a few places too... its a nice quad... with power.. but not over 50 stock.. or 40...

 

My 416EX made 33 RWHP on that same dyno.

 

Most dyno reports show 37 rwhp stock with sparks pipe and jetting k&n pro-flow and exhaust cam retard 1 tooth they jump to 47
Theres alot of variables humidity air temp altitude ect.
It's a lot stock and theres alot more to uncork[img]i/expressions/face-icon-small-cool.gif[/img]