Yamaha Utility ATV Parts
Lookup Yamaha Utility ATV Parts
The Grizzly 550 shares a lot in common with its big brother. Yamaha isn’t shy about mentioning that the Grizzly 700 FI is the top selling big bore utility ATV, and it is a great machine to try and emulate. The chassis for the 550 is based on the 700, and most of the features and styling are also borrowed Yamaha’s flagship utility ATV. Yamaha’s electric power steering is pretty progressive in that it is both torque and speed sensitive. This means that when there is more torque on the handlebars, more steering assistance is provided. Also, when you are operating at slower speeds, more assistance is provided than when you are flying along the trails at higher speeds. Powering the Grizzly 550 is a 558cc, 4-stroke, liquid-cooled, fuel-injected SOHC engine. This engine is, not surprisingly, based on the Grizzly 700 FI and includes a ceramic composite plating cylinder and a forged aluminum piston. It’s not exactly like the 700, though, as the bore has been reduced from 102mm to 92mm and it has a new intake and exhaust port and a new cylinder head. According to Yamaha, the size of the valve and combustion chamber has been optimized for a 558cc engine, improving throttle response and bottom end power. The Grizzly 550 actually provides a lot of top-end power, perhaps equal to the 700, and it’s plenty fast for a utility quad.
If you’re comparing the power and response of the Grizzly 550 to other 500-class machines, it’s probably at or near the top of the list. If you just use your ATV for riding along the trails, climbing rocks and doing a little work around your property, this is plenty of engine. Switching from two to four-wheel drive can be done at the push of a button on the fly. Because of the Ultramatic transmission, Yamaha says you can choose to ride in whatever gear you’re comfortable with. If you like to slide around the corners, keep it in two-wheel drive. If you like your back tires to help push you over all sorts of terrain, keep it in four-wheel drive. To keep the engine breathing easier, the intake and exhaust ducts are located as high as possible, near the handlebars. The air box is also located high and includes a water trap, which is designed to contain water before it reaches the engine. If you tend to ride in deep water and mud this could come in very handy. Another high point of the Grizzly 550 FI is the braking system. It comes standard with four-wheel hydraulic disc brakes with a caliper on each wheel. Also, hydraulic master cylinders mean there is a solid link to all four wheels instead of linkage and cables from the levers to the wheels.
Engine braking is not exactly new, but I really like the setup on the Grizzly 550. It activates at a higher speed and you can choose two or four-wheel engine braking by switching from two to four-wheel drive. Two-wheeled engine braking works fine if you have traction and don’t need to slow right down. In four-wheel drive, all four wheels engage and you can crawl down a very steep descent without touching the brake levers. The Grizzly 550 also features the same digital meter as the 700, which includes speedometer, odometer, dual trips, clock, hour meter, four-wheel drive indicator, transmission position, fuel gauge and self-diagnostic and actuator system.
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