253fmm Service Manual — !!install!!

Check the carburetor diaphragms for tears and the ignition timing.

Before turning a wrench, confirm your engine code. The designation breaks down under the Chinese national manufacturing standard: 2: Two cylinders 53: 53mm cylinder bore F: Natural air cooling M: Motorcycle engine M: 250cc-range displacement class Technical Specifications Table Specification Engine Type Parallel Twin, 4-Stroke, SOHC, 2 Valves per Cylinder Actual Displacement 233 cc (often rounded to 250cc) Bore x Stroke 53.0 mm × 53.0 mm Compression Ratio Cooling System Air-cooled (some variants feature an auxiliary oil cooler) Max Power output ~16.1 HP (12.0 kW) @ 8,500 RPM Max Torque ~15.0 Nm @ 7,000 RPM Lubrication System Wet sump, pressure/splash combination Clutch Type Wet, multi-plate, cable-operated Transmission 5-speed constant mesh, sequential foot shift 2. Routine Maintenance Schedule 253fmm service manual