CG Crankshaft Assy Pin 15mm

CG Crankshaft Assembly - 15mm Pin

🔧 Crankshaft Assembly · Engine Crankshaft · Overhaul Core Component · CG125/CG150 Specific

Standard OEM Quality · For 125cc/150cc 4-Stroke Engines · 15mm Piston Pin

This is the CG Crankshaft Assembly (15mm Pin) — a replacement crankshaft in standard OEM quality designed for 125cc/150cc 4-stroke engines. This component is the heart of the engine, converting the reciprocating motion of the piston into rotational motion to output power.

The crankshaft is one of the most critical and heavily stressed components in an engine, bearing enormous alternating loads from combustion pressure. Manufactured from high-quality alloy steel with precision machining, dynamic balancing, and heat treatment, this crankshaft ensures smooth operation, wear resistance, and durability. This is the perfect replacement when the original crankshaft suffers from wear, bending, bearing damage, or operational noise. This product is designed for CG series engines with 15mm piston pin.

⚠️ Important: Piston Pin Size Confirmation

This is the 15mm piston pin version. CG125/CG150 engines come with two common piston pin sizes: 13mm and 15mm. Please verify your original piston pin diameter before purchasing to ensure correct selection. If unsure, measure the original piston pin or consult your engine service manual.

This crankshaft assembly is compatible with the following engines and vehicles:

• Engine Types: CG125, CG150 4-stroke engines
• Piston Pin Size: 15mm (verify your original is 15mm)
• Vehicle Types: Honda CG series, Chinese-made CG series motorcycles, dirt bikes, street bikes
• Applications: Engine overhaul, worn crankshaft replacement, noise repair, power restoration

• High-Quality Alloy Steel: Manufactured from high-strength alloy steel with forging and heat treatment for excellent strength and wear resistance.
• Precision Machining: Journals are precision-ground with roundness and cylindricity meeting OEM specifications for accurate fit.
• Dynamic Balanced: Precision dynamic balancing ensures smooth operation and reduced engine vibration.
• OEM Quality: Manufactured to CG series original specifications for perfect fitment.
• Quality Bearings: Fitted with high-quality ball or needle bearings for smooth rotation and long service life.
• Essential Overhaul Component: The crankshaft is a core component during engine overhaul — this product is critical for restoring engine performance.

🔧 Installation Guide

1. Ensure the engine is completely disassembled and clean the crankcase before starting.
2. Inspect the crankcase bearing seats for wear or damage; repair if necessary.
3. When installing the new crankshaft, use a press tool to avoid impact damage.
4. When installing crankshaft bearings, pay attention to orientation and use a press tool.
5. When installing the connecting rod and piston, verify proper clearance with the small end.
6. When installing timing gear or chain, ensure timing marks are aligned.
7. After installation, manually rotate the crankshaft to confirm smooth operation without binding.
8. It is recommended to replace crankshaft oil seals, bearings, and piston rings simultaneously for optimal engine performance.
9. Crankshaft installation involves critical engine components — professional installation is strongly recommended.

⚠️ Important Notice: This product is the CG Crankshaft Assembly with 15mm piston pin, designed for CG125 and CG150 4-stroke engines.
Spec Confirmation: Before purchasing, verify your original piston pin diameter is 15mm (not 13mm). CG engines have two piston pin sizes — please measure and confirm before ordering.
Installation Caution: Crankshaft installation requires specialized tools and skills. Use proper tools during installation to avoid damage. It is recommended to replace crankshaft oil seals and bearings simultaneously. Professional installation is strongly recommended. Product images are for reference only; please refer to the actual product.