90 cc yamaha

*Yamaha 90cc Engine Specifications*

- *Engine Type:* 4-stroke, single-cylinder, air-cooled
- *Displacement:* 89cc
- *Bore x Stroke:* 50mm x 46mm
- *Compression Ratio:* 9.5:1
- *Fuel System:* Carburetor
- *Ignition:* CDI

*Performance*

- *Power:* 7-8 horsepower (5.2-5.9 kW) @ 7,500 rpm
- *Torque:* 5.5-6.5 lb-ft (7.5-8.8 Nm) @ 6,000 rpm
- *Top Speed:* approximately 60-70 km/h (37-44 mph)

*Transmission and Drivetrain*

- *Transmission:* 3-speed or 4-speed semi-automatic