125cc 4-Stroke Engine Kit for CRF50 XR50 Z50 Pit Bikes

Complete 125cc 4-stroke engine kit with a 4-speed manual gearbox for mini bikes and pit bikes.

Key Features

• Single-cylinder OHC air-cooled engine, 123.7cc
• 8.72 hp at 7,500 rpm
• Kick start with CDI ignition
• Wet manual clutch with 4-speed gearbox
• Carburetor, intake manifold and levers included

Specifications

• Type: 4-stroke single cylinder, OHC, air cooled
• Displacement: 123.7cc
• Bore x stroke: 54 x 54 mm
• Compression ratio: 9.47:1
• Max power: 8.72 hp at 7,500 rpm
• Max torque: 8.0 N·m at 5,500 rpm
• Idle: 1,500 rpm
• Start: kick
• Ignition: CDI
• Spark plug: A7TC or C6HSA, gap 0.6-0.8 mm
• Lubrication: pressure / splash
• Oil capacity: 0.9 L (15W-40)
• Clutch: manual, wet
• Gears: 4-speed, ratios 2.833 / 1.706 / 1.238 / 0.958
• Voltage: 12 V, permanent magnet magneto
• Sprocket: 428, 15T, 17 mm
• Size: 18.25 x 11 x 11 in
• Weight: 44.25 lb (engine only)
• Fitment: CRF50, CRF70, XR50, XR70, Z50, Z50R, CT70 Mini Trail, XL70, ST70, QA50, QR50, CL70, SL70, 70 Passport, ST90, CS90, SL90, ZB50 (check fitment before ordering)
• Package contents: 1 engine, 1 kick starter lever, 1 gear shift lever, 1 carburetor, 1 intake manifold, 2 intake gaskets

Note: Installation requires mechanical skill. Check local rules before road or water use.