C100 Cylinder Stud Bolt

C100 Cylinder Stud Bolt

🔧 Cylinder Stud Bolt · Engine Fastener · Cylinder Head Bolt

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

This is a C100 Cylinder Stud Bolt, a critical fastener for engine assembly. It is suitable for Mopeds, Cub series, Dirt Bikes, and ATVs, and fits engines including 139FMB, 147FMD, 147FMF, 150FMG, and similar models.

The cylinder stud bolts secure the cylinder head to the cylinder block, withstanding the high temperatures and pressures generated during engine operation. They are among the most important fasteners in the engine. Manufactured from high-strength steel with excellent tensile strength and fatigue resistance, they are an ideal replacement when original bolts are damaged, stripped, or corroded.

These C100 cylinder stud bolts fit the following engine models:

• Mopeds - Various 50cc-150cc moped models
• Cub Series - Honda Cub and clone models
• Dirt Bikes - Mini dirt bikes, off-road motorcycles
• ATVs - Small-engine quad bikes / kids ATVs
• Other vehicles using 139FMB, 147FMD, 147FMF, 150FMG engines

Cylinder stud bolts are among the most important fasteners in the engine, with critical functions:

• Secures Cylinder Assembly: Firmly holds the cylinder head to the cylinder block, ensuring engine structural integrity.
• Ensures Gasket Seal: Provides uniform clamping force to ensure proper cylinder head gasket sealing, preventing leaks.
• Withstands High Loads: Bears the high temperatures and pressures generated in the combustion chamber.
• Critical Precision: Bolt strength and proper torque directly affect engine reliability and service life.

• Blown Head Gasket: Gasket failure causing compression loss, coolant leaks, oil contamination.
• Coolant in Cylinders: Coolant consumption, white smoke from exhaust.
• Low Compression: Loss of power, hard starting.
• Oil Emulsification: Milky oil indicates coolant entering the oil system.
• Loose Bolts: Insufficient torque leading to loosening.
• Broken Bolts: Overload or fatigue causing bolt fracture.
• Stripped Threads: Damaged threads preventing proper tightening.

If you experience these symptoms, inspect the cylinder bolts and replace if necessary.

• OEM Specifications: Manufactured to original specifications for perfect fitment.
• High-Strength Material: Made from quality high-strength steel with excellent tensile strength.
• Precision Threads: Precision-machined threads for smooth installation and accurate fit.
• Corrosion Resistant: Surface treated for rust resistance and long service life.
• Two Length Options: Available in 196mm and 204mm lengths for different engine requirements.
• Direct Replacement: Perfect substitute for damaged, stripped, or corroded original cylinder stud bolts.

💡 Selection Tip: Measure your original bolt length or consult your engine model to select the correct length. Contact customer service if you need assistance.

🔧 Installation Tip

1. It is recommended to replace the cylinder head gasket when replacing cylinder stud bolts.
2. Clean the cylinder block and cylinder head threaded holes to remove oil and debris.
3. Thread the bolts into the holes by hand until seated.
4. Use a torque wrench to tighten bolts in the specified sequence, in 2-3 stages.
5. Torque specification for M6 bolts is typically 8-12N·m; refer to your service manual.
6. After installation, check for proper sealing and start the engine to verify no leaks.

⚠️ Important Notice: These are C100 cylinder stud bolts with 6mm diameter, available in 196mm and 204mm lengths. Suitable for Mopeds, Cubs, Dirt Bikes, ATVs, and vehicles using 139FMB, 147FMD, 147FMF, 150FMG engines. Before purchasing, please verify your original bolt length. Cylinder bolts are critical engine fasteners; proper torque must be applied during installation. Images are for reference only. The actual product may vary.