Stock 39 hp.
42-43 hp
39.5
I think you mean a YZ450F.....47.22 hp @ 8700 rpm. Cheers, Bill from Turner Valley, AB
go to gtthunder.com they have dyno charts YFZ 450 has 39 hp
That is something you will need to research on your own. The horsepower ratings are Honda 450R 42 hp and the YFZ 450 39 hp. But you are as aware as I am that hp ratings aren't the whole story, especially in the dirt. yamaha450-i don't care what people say a yfz450 is faster than a trx450...acceleration and top speed...a yfz is lighter (approx 100pounds) but a trx is said to last longer...honda is know for quality...but my yfz has been fine except for the water seal breaking...so as long as you service it properly I would go yfz
Stock around 35-40
50 HP stock
around 65 hp.
33-35 hp stock.
The Honda 450 R came from the factory with 33 hp
They have already come out with 300 hp outboard. They are thinking about releasing a 450 hp outboard late next year (2012).