Yamaha is an international manufacturer of a variety of products, including electronic, musical and vehicular hardware. Yamaha's catalog includes the Raptor series of ATVs. The 2011 Yamaha Raptor 660R and 2005 Raptor 700R feature subtle differences in size, engine and equipment specifications.
Fuel System, Ignition and Transmission
A Yamaha Raptor 700R has a 1.73-inch Yamaha Fuel Injection system while the Yamaha Raptor 660R uses a 1.30-inch Dual Mikuni BSR fuel delivery system. The 700R has a 16-bit engine control unit that governs the ignition, and the 660R uses a capacitor discharge ignition system. The transmission for the 700R is a five-speed, wet multiplate clutch with reverse. The transmission for the 660R is a five-speed manual clutch, also with reverse. Both Raptors use an electric starting system.
The Yamaha Raptor 700R utilizes a four-valve, four-stroke, liquid cooled engine. This motor has a displacement of 686 cubic centimeters and a compression ratio of 9.2-to-one. The bore for these cylinders is 4.02 inches in diameter and the stroke is 3.31 inches in depth. A 660R Raptor uses a liquid-cooled, four-stroke motor with five valves. This engine has a displacement of 660 cubic centimeters and a ratio of 9.2-to-one. The bore measures 3.94 inches in diameter and the stroke is 3.31 inches deep.
Yamaha 700R Raptors are 44.5 inches tall, 46.1 inches wide and 72.6 inches in length. This model has a wheelbase of 50.4 inches and a ground clearance of 4.4 inches. The seat height for this ATV is 32 inches. The 660R Raptor is 45.3 inches tall, 43.3 inches wide and 72 inches long. This unit has a wheelbase of 49 inches, a ground clearance of 4.5 inches and a seat height of 33.9 inches.
Suspension and Brakes
A Yamaha 700R Raptor uses ventilated, rear hydraulic disc brakes with a park brake function that is self-adjusting. The front brakes are twin piston, dual ventilated hydraulic discs. Yamaha 660R Raptors have a hydraulic disc brake in the rear and dual hydraulic disc brakes in the front. The 700R utilizes an independent, double wishbone suspension that features rebound adjustment and variable speed compression. The rear suspension for this ATV is a swing arm model made of cast aluminum. A 660R Raptor uses similar front and rear suspensions, but does not include the variable speed compression feature.The rear suspension for the 660R Raptor has a travel that is 1.4 inches smaller.
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