How much horsepower does a 2007 Yamaha YFZ450 have?

Arctic Cat (suzuki engines, except the kawi-powered V2, and arctic cat's own H1):

500: (2003 and up have slightly detuned Vinson engine): 32hp @7000rpm, 34 lb-ft torque at 3500rpm (pre-03 had 28/30.5)

300: 14hp

650 V2: (close to prarie 650)

454 Bearcat: 28hp

Bombardier (Rotax engines):

Outty 800: 62hp @ ? rpm, 52tq @ 5500rpm

Quest 650: 42hp

Outty 400: 28hp

DS 650: 49hp

Honda:

Rincon 650: 39hp

Foreman 450: 24hp

TRX 300: 16hp

Rancher 350: 19hp

400EX: 27hp

300EX: 21hp

TRX450R: 42hp (questionable)

Kawaski:

BF750: 51hp

Prarie 700: 46hp

Prarie 650: 42hp

V-Force 700: 51hp

Polaris:

SP700: 45hp

SP500: 32hp

SP500 HO: 37hp (same as scrambler 500)

SP800: 55hp/50tq

400 (2-stroke): 35hp

SP335: 22hp

425 Magnum: 27hp

Suzuki:

KQ700: 49hp

KQ300: 14hp

LT500: 53hp

Eiger 400: 24hp

Vinson 500: 34hp

Yamaha:

Grizz 660: 42hp/35tq

Warrior/Wolverine 350: 19hp/19tq

Raptor 660: 43hp

Kodiak 400: 21hp

Big Bear 350: 18hp

Grizzly 600: 37hp

Banshee 350: 39hp

YZF 450: 39hp

----

since its a YFZ its a four stroke, for every 24.8 cc's on an engine theres one horsepower... divide 450 by 24.8 and you get around 24.867 horspower