Cylinder Block 100cc / 110cc

C110 Cylinder Block

🏭 Cylinder Block · Cylinder Barrel · Engine Component

For Moped, Cub, Dirty Bike & ATV · Fits 139FMB, 147FMD, 147FMF, 150FMG engines

This is the C110 Cylinder Block, a core component of the engine's combustion chamber. It is suitable for Mopeds, Cub series, Dirty Bikes, and ATVs, and fits engines including 139FMB, 147FMD, 147FMF, 150FMG, and similar models.

The cylinder block (cylinder barrel) is the working chamber where the piston reciprocates. Together with the piston, piston rings, and cylinder head, it forms a sealed combustion chamber. Manufactured from high-quality cast iron or aluminum alloy (depending on model), the inner surface is precision-honed to create a specific cross-hatch pattern that aids oil retention and piston ring break-in, ensuring excellent wear resistance, sealing, and heat dissipation. This cylinder block is the ideal replacement when the original cylinder shows signs of scoring, excessive wear, out-of-round condition, or bore scratching.

This cylinder block fits the following engine models:

• Mopeds - Various 50cc-150cc moped models (underbones, scooters, etc.)
• Cub Series - Honda Cub and clone models
• Dirty Bikes - Small off-road motorcycles
• ATVs - Small-engine quad bikes / kids ATVs
• Other vehicles using 139FMB, 147FMD, 147FMF, 150FMG engines

• Power Loss: Cylinder wear leads to poor sealing, reduced compression pressure, and noticeable power decrease.
• Oil Burning: Blue smoke from exhaust, increased oil consumption, heavy carbon buildup on spark plug.
• Hard Starting: Low compression makes starting difficult, especially when cold.
• Knocking Noise: Excessive piston-to-cylinder clearance causes metallic knocking during operation.
• Increased Fuel Consumption: Reduced combustion efficiency leads to significantly higher fuel consumption.
• Low Cylinder Compression: Compression test results below standard specification.
• Bore Scoring or Scuffing: Visible scratches or scuff marks on cylinder bore during inspection.

If you experience these symptoms, inspect the cylinder block and piston components, and replace if necessary.

• OEM Specifications: Manufactured to original dimensions and tolerances for perfect fitment.
• Precision Honed Bore: Cylinder bore is precision-honed with a cross-hatch pattern for optimal oil retention and ring break-in.
• High-Quality Material: Made from high-quality cast iron or aluminum alloy with excellent wear resistance and heat dissipation.
• High Precision Machining: Bore roundness and cylindricity are held to tight tolerances for precise piston-to-cylinder clearance.
• Optimized Cooling: Enhanced cooling fin design ensures stable operating temperature under high load conditions.
• Direct Replacement: Directly replaces worn or damaged original cylinder block without modification.

🔧 Installation Tip

1. Replacing the cylinder block requires removing the engine and cylinder head; professional installation is recommended.
2. Clean cylinder and crankcase mating surfaces thoroughly and replace with a new cylinder gasket.
3. When installing piston rings, ensure proper ring gap orientation with gaps staggered according to specifications.
4. Apply engine oil to piston and cylinder bore for pre-lubrication before installation.
5. Use a piston ring compressor when installing the piston to avoid damaging rings or scoring the bore.
6. Tighten cylinder head bolts in a crisscross pattern to the specified torque.
7. After installation, add appropriate engine oil and manually rotate the crankshaft several times to check for binding.
8. New cylinder block requires a break-in period; avoid high RPM and heavy loads during initial operation.

⚠️ Important Notice: This is a C110 cylinder block (cylinder only) suitable for Mopeds, Cubs, Dirty Bikes, ATVs, and vehicles using 139FMB, 147FMD, 147FMF, 150FMG engines.
Specification Selection: For 70cc/90cc engines, select the cylinder block for 47mm pistons. For 110cc engines, select the cylinder block for 52.4mm pistons. Please verify your engine displacement and original specifications before purchase.
Note: This product is a cylinder block only and does not include piston, piston rings, or piston pin; these must be purchased separately. Always use a new cylinder gasket and tighten cylinder head bolts to the specified torque. Images are for reference only. The actual product may vary.