CG 125cc Cylinder Block

CG125 Cylinder Block

🔧 Cylinder Block · Cylinder Barrel · Engine Rebuild Part · CG125 Air Cooled Specific

For CG125 Air Cooled Engines · OEM Specification · High-Quality Cast Iron Liner

This is the CG125 Cylinder Block — a replacement cylinder for the CG125 air cooled engine. Manufactured to OEM specifications with high-quality materials, this cylinder block is an ideal choice for engine overhaul or performance restoration.

The cylinder block is a core component of the engine, providing a precision guide for piston reciprocating motion and forming a sealed combustion chamber with the piston and cylinder head. This cylinder block features a high-quality cast iron liner for excellent wear resistance and heat transfer, with external cooling fins to ensure proper heat dissipation during operation. This is the perfect replacement when the original cylinder suffers from scoring, excessive wear, out-of-round condition, or when piston rings can no longer seal effectively.

This cylinder block is compatible with the following engines and vehicles:

• Engine Types: CG125 Air Cooled 4-stroke engines
• Vehicle Types: Honda CG125, Chinese-made CG series motorcycles, dirt bikes, street bikes
• Piston Specification: Suitable for 56.5mm diameter pistons
• Applications: Engine overhaul, cylinder scoring repair, oil burning repair, power restoration

• High-Quality Cast Iron Liner: Made from high-wear-resistance cast iron with precision-honed surface for excellent piston ring sealing.
• Aluminum Alloy Block: Lightweight aluminum construction with superior heat dissipation and high strength.
• Precision Machining: Cylinder bore is precision-machined with roundness and cylindricity meeting OEM specifications for smooth piston operation.
• Optimized Cooling Fin Design: Well-designed cooling fins maximize heat dissipation area for stable engine operation.
• OEM Specification Standards: Manufactured to CG125 original specifications for perfect fitment.
• Essential Overhaul Part: Ideal choice for engine overhaul or piston replacement to restore engine power.

🔧 Installation Guide

1. Ensure the engine is completely cooled and disconnect the negative battery terminal before starting.
2. When removing the old cylinder, clean the crankcase mating surface thoroughly to remove old gasket residue.
3. Inspect the new cylinder bore for any scratches or rust; wipe the bore with a clean cloth before installation.
4. Apply a small amount of engine oil to the cylinder wall and piston rings before installation to prevent dry start-up.
5. Use a new cylinder base gasket to ensure proper sealing.
6. When installing the cylinder, use a piston ring compressor tool to avoid damaging the rings and cylinder wall.
7. Tighten cylinder head bolts in a diagonal pattern in multiple stages to the specified torque (approx. 20-25 N·m).
8. After installation, start the engine and check for gas or oil leaks; allow proper break-in period.

⚠️ Important Notice: This product is the CG125 Cylinder Block, designed for CG125 air cooled engines with 56.5mm bore diameter.
Spec Confirmation: Before purchasing, verify your engine is the CG125 air cooled type with 56.5mm piston diameter.
Installation Caution: Cylinder block installation involves critical engine components. Professional installation is strongly recommended. Always use a new cylinder head gasket and tighten bolts to the specified torque. It is recommended to replace the piston, piston rings, and cylinder head gasket simultaneously for optimal sealing results. Product images are for reference only; please refer to the actual product.