JH70 Piston Assy

C70 Piston Assembly

🔧 Piston · Piston Rings · Piston Pin · Engine Piston

For Moped, Cub and ATV · Fits 139FMB, 147FMD, 147FMF, 150FMG engines and more · Multiple displacement options

This is a C70 piston assembly designed for Mopeds, Cub motorcycles, and ATVs, perfectly compatible with 139FMB, 147FMD, 147FMF, 150FMG engine series. The piston is the core component of an engine, responsible withstanding combustion pressure and transferring force through the connecting rod to the crankshaft, converting thermal energy into mechanical energy.

This replacement piston assembly includes the piston body, compression rings, oil control rings, piston pin, and circlips. All components are manufactured from high-quality materials to ensure proper engine operation. When the original piston wears out causing power loss, oil burning, abnormal noise, or low compression, this product is the ideal replacement choice.

Compatible vehicles include:

Package Includes: Each piston assembly includes piston body, compression rings, oil ring, piston pin, and circlips.

• Power loss: Poor acceleration, difficulty climbing hills, reduced top speed.
• Oil burning: Blue smoke from exhaust, excessive oil consumption.
• Low compression: Hard starting, low cylinder pressure readings.
• Abnormal noise: Knocking or tapping sounds from engine interior.
• Increased fuel consumption: Noticeable rise in fuel usage.

If you experience these issues, inspect the engine, check piston, piston ring, and cylinder wear, and replace the piston assembly or rebore the cylinder as necessary.

• High-quality aluminum alloy: High-strength aluminum alloy, lightweight, good thermal conductivity, low expansion coefficient.
• Precision machining: Piston skirt precision-machined to OEM specifications for proper cylinder clearance.
• High-quality piston rings: Includes compression rings and oil ring with good elasticity and wear resistance for sealing and oil control.
• Complete accessories: Includes piston pin and circlips - no need to purchase separately.
• Multiple displacement options: Available in 47mm, 50mm, 52.4mm sizes to meet different displacement requirements.

🔧 Installation Tips

1. Before installation, check cylinder for wear or scoring; rebore or replace cylinder if necessary.
2. Clean piston, piston rings, and cylinder, removing all carbon deposits and oil.
3. When installing piston rings,注意 ring orientation and gap positions (typically staggered 120 degrees).
4. When installing piston pin and circlips, ensure circlips are fully seated in their grooves.
5. Apply适量 oil for lubrication during installation; tighten connecting rod bolts to specified torque.
6. Proper break-in is required after installation (avoid high loads for first 500 km).

⚠️ Important Notice: This product is a C70 piston assembly suitable for Mopeds, Cub motorcycles, ATVs with 139FMB, 147FMD, 147FMF, 150FMG engines. When purchasing, select the appropriate piston specification based on your cylinder displacement. Engine overhaul requires specialized knowledge and tools; professional installation is recommended. Images are for reference only; actual product may vary.