Polaris 850______69.06 hp
Can Am 800 R____67.05 hp (updated 2/13 to 70.5 hp)
AC 1000_________65.84 hp
Can Am 800______61.7 hp
Can Am 650______55.4 hp
Brute 750 Carb____50.1 hp
Brute 750 EFI_____49.8 hp
King Quad 750____49.6 hp
AC Mud Pro_______49.06 hp
King 700_________48.5 hp
Polaris 800_______48.3 hp
Brute 650 I________46.3 hp
Grizzly 700________45.6 hp
Polaris 700_______44.3 hp
AC 700 H1_______41.4 hp
AC 700__________41.4 hp
Brute 650 ________41.4 hp (solid axle)
Grizzly 660_______40.9 hp
Can Am 500______40.4 hp
AC 650 H1_______39.3 hp
Rincon 680_______38.5 hp
Grizzly 550________36.9 Hp
10 hp if far from negligible even the discontinued 660 has a 10% power advantage. They both use the same 4-stroke single, 4-valve SOHC but the 550 has a smaller 40 mm throtle bady efi while the 700 has a larger 44mm + its 128cc advantage.
There are people who spend $1000 on pipes,jet kits.clutch kits just to get a 5 hp increase.
The only thing negligible between the two is there price.
2009 Yamaha Grizzly 550 FI Auto. 4x4 EPS ATVs