labwork 125cc 4-Stroke Engine Motor Kit with Manual Clutch for Honda CRF50 XR50 Z50 and Mini Bikes

Product Description

This 123.7cc 4-stroke single-cylinder engine kit is designed for selected Honda-style mini bikes, pit bikes, and trail bike applications. It features air cooling, a manual wet clutch, kick start, and an international 4-speed transmission.

Compatibility

Suitable for selected applications including:

• Honda CRF50, CRF70
• Honda XR50, XR70
• Honda Z50, Z50R
• Honda CT70 Mini Trail
• Honda Minitrail Monkey
• Honda XL70, ST70
• Honda QA50, QR50
• Honda CL70, SL70
• Honda 70 Passport
• Honda ST90K1, ST90K2
• Honda CS90, ZB50

Specifications

• Type: 4-Stroke Single-Cylinder OHC Engine
• Cooling: Air-Cooled
• Displacement: 123.7cc
• Bore × Stroke: 54 × 54 mm
• Compression Ratio: 9.47:1
• Maximum Power: 8.72 HP at 7,500 RPM
• Maximum Torque: 8.0 N·m at 5,500 RPM
• Idle Speed: 1,500 RPM
• Starter: Kick Start
• Clutch: Manual Wet Clutch
• Gear Shift Pattern: International 4-Speed, 1-N-2-3-4
• Gear Ratios: 2.833 / 1.706 / 1.238 / 0.958
• Ignition: CDI not included
• Voltage: 12V
• Sprocket: 428 chain, 15T, 17 mm
• Spark Plug Compatibility: A7TC or C6HSA
• Plug Gap: 0.6-0.8 mm
• Lubrication: Pressure / Splash
• Oil Capacity: 0.9 L, 15W/40-SE
• Engine Dimensions: 18.25 × 11 × 11 in
• Engine Weight: Approximately 44.25 lb
• Fitment Type: Replacement Engine

Features

• 125cc 4-stroke air-cooled engine
• Manual wet clutch with heavy-duty three-disc crank-mounted design
• International 4-speed transmission
• Kick-start operation
• Large combustion chamber with 27 mm intake and 23 mm exhaust valves
• 428 chain sprocket with 15 teeth
• Suitable for selected mini bikes, pit bikes, and trail bike projects

Package Includes

• 1 × 125cc 1P52FMI Engine
• 1 × Kick Starter Lever
• 1 × Gear Shift Lever
• 1 × Carburetor
• 1 × Intake Manifold
• 2 × Intake Gaskets

Important Notes

• CDI and ignition system are not included.
• The engine is drained of oil before shipment. Add suitable 4T engine oil before initial startup.
• The engine must be in neutral before starting with the kick starter.
• Verify the product dimensions, mounting points, wiring, chain alignment, and transmission configuration before ordering.
• Professional installation is recommended.