Wholesale Motorcycle crankshaft designed for YZ125 Suppliers, Supplier

For  Honda CG250 Zongshen CG250 underbone motorcycles, It has a cylinder bore of 67mm, a stroke of 53mm, and is a key component for converting piston reciprocating motion into crankshaft rotational motion in 250cc single-cylinder four-stroke engines.

Product Description

Product Overview

Specifically designed for the CG125 motorcycle engine, this connecting rod is typically forged from high-strength steel or alloy, ensuring it can withstand the high stresses and dynamic loads within the engine. It features precision-machined bearing surfaces, a piston pin bore, and a crankshaft journal interface. The rod incorporates a needle bearing (or bush) at the piston pin end for reduced friction and wear. Its design adheres to strict dimensional and structural standards, making it a direct replacement for the OEM component. Whether for engine maintenance, rebuilds, or performance upgrades, this connecting rod delivers reliable performance, durability, and compatibility with the CG125's engine architecture.

Key Advantages

1High-Strength Construction

Forged from premium steel/alloy, it resists bending, cracking, and deformation under extreme engine loads, ensuring long-term reliability.

2Precision Engineering

Machined to exact tolerances, it ensures proper alignment between the piston and crankshaft, minimizing vibration and optimizing engine efficiency.

3Efficient Friction Reduction

The integrated needle bearing (or bush) at the piston pin end reduces friction, enhancing wear resistance and extending the component's service life.

4Seamless Compatibility

Designed specifically for CG125, it fits perfectly with the piston, crankshaft, and other engine parts, enabling easy installation and restoring factory-like performance.

Applications

1CG125 Engine Rebuilds

Essential for restoring engine functionality when replacing worn or damaged connecting rods during full engine overhauls.

2Routine Maintenance & Repairs

Used to address issues like rod wear, misalignment, or bearing failure in CG125 engines.

3Performance Upgrades

A foundational component for engine modifications (e.g., bore-up kits, high-compression builds) on CG125-based engines.

4OEM Replacement

Utilized by motorcycle manufacturers or assemblers for new CG125 production or engine component replacements.

Product Specification

Specification Item Details
Model Compatibility CG125 motorcycle engine
Material Forged steel (standard); Alloy steel (performance variant)
Piston Pin Bore Diameter Matches CG125 piston pin size (typically 15mm)
Crankshaft Journal Fit Precision-machined to match CG125 crankshaft journal dimensions
Bearing Type (Piston End) Needle roller bearing (common) or bronze bush
Weight Approx. 200-250g (varies by material and design)
Operating Temperature Up to 200°C (under normal engine operation)
Service Life Up to 30,000-40,000 km (varies with maintenance and riding conditions)
Certification Complies with motorcycle engine component quality standards

Frequently Asked Questions (FAQ)

What materials is this connecting rod made of?

This connecting rod is forged from high-strength steel for standard applications, and premium alloy steel for high-performance variant upgrades, ensuring resistance to bending and deformation.

Is this connecting rod a direct OEM replacement for the CG125?

Yes. It is engineered and machined to exact dimensional and structural tolerances of the CG125 engine, facilitating a seamless fit with existing pistons and crankshafts.

What type of bearing is used at the piston pin end?

It typically incorporates a needle roller bearing or a bronze bush, which significantly minimizes friction, reduces wear, and extends the operational life of the engine components.

What is the average service life of the CG125 connecting rod?

With proper maintenance and standard riding conditions, this connecting rod offers a reliable service life of up to 30,000 to 40,000 kilometers.

Can this connecting rod be used for engine modification or upgrades?

Absolutely. It is an ideal foundational component for engine rebuilds, performance tuning (such as bore-up kits or high-compression builds), and routine aftermarket repairs.

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