Established in 1992, Sumai Bicycle Co.,Ltd. is one of the biggest China yamaha dirt bike manufacturer and wholesaler. We've gotten the WMI (World Manufacturer Identification) since 2005. Our company has perfect quality management systems with ISO9001 international quality authentication in 2002 and pays great attention to new product development. We have high-quality staff at design, oem yamaha dirtbike development and production fields, and have introduced in qualified personnel from foreign bicycle enterprise. Most of our products have been approved with CE certificate, and some approved with EEC, EPA and CARB.

The two stroke 250 has had some work done on the forks for this year, the thickness of the outer and inner fork tubes has been changed and the damping settings have been revised. The rear suspension has new aluminium components to save weight and the settings have been changed to match the altered front forks. The 125 for '07 has also had the same mods as the 250 done to the suspension front and rear. There have been changes made to the ignition map and silencer for improved bottom end and mid range power. The 125 and 250 have a new stainless steel clutch cable for durability, they also have the works style clutch adjuster, Pro Taper bars, gripper seat and titanium footpegs that are standard equipment on the four stroke bikes as well.

Yamaha has been leading the motorcycle industry in technical innovation and ingenuity since our first bike hits the streets in 1955: a 125cc, single cylinder 2-stroke street bike. Let's just say we've come a long way and will continue to lead the way in the years to come. Catalytic Converters. Electronic Fuel Injection. Inverted Forks. Controlled Filling Die Casting (C.F. Die Casting). The Yamaha dirt bikes range came to the fore again prominently in 1998 with the release of the YZ400F, at its time of release the only serious mid capacity four stroke motocrosser on the market. This bike set the benchmark for the four stroke revolution with all the other major manufacturers scrambling to play catch up with their own four stroke motocrossers. Rev your engine and hit the streets with the miniature electric Razor Pocket Rocket, a scaled-down street bike that's perfect for cruising the cul de sac. The Pocket Rocket's variable-speed, chain-driven motor is designed to reach powerful speeds of up to 15 miles per hour, with large 10-inch pneumatic tires guaranteeing a smooth ride.

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