Forged 4340 Steel Motorcycle Engine Connecting Rod

This forged 4340 steel motorcycle engine connecting rod is precision-engineered for high-performance motorcycle engines, including Honda CB series and Yamaha YZF models. Manufactured from premium 4340 alloy steel through a multi-stage forging process, it delivers exceptional tensile strength and fatigue resistance under extreme RPM conditions.

Key Features

• Premium Material: Forged from 4340 chromium-molybdenum steel for maximum durability and impact resistance
• Motorcycle-Specific Design: Optimized weight-to-strength ratio for motorcycle engine RPM ranges (8,000-14,000 RPM)
• Precision Machining: Center-to-center length tolerance of +/- 0.01mm; big end bore honed to H6 tolerance
• Heat Treated: Quenched and tempered to HRC 35-40 for optimal balance of hardness and toughness
• Shot Peened Surface: Compressive surface stress enhances fatigue life by 30% over untreated rods
• 14mm Piston Pin: Exact fit for common motorcycle engine piston pin diameters

Technical Specifications

Quality Assurance

Each connecting rod undergoes magnetic particle inspection for surface defects, dimensional verification with CMM equipment, and weight-matching to within +/- 3g per set. ISO 9001:2015 certified production ensures consistent quality batch after batch.

Application

Ideal for motorcycle engine rebuilds and performance upgrades. Compatible with Honda CB series (CB400, CB600, CB900) and Yamaha YZF series (YZF-R1, YZF-R6) motorcycle engines. Also suitable for custom motorcycle engine builds requiring reliable high-RPM connecting rods.

Packaging

Each rod is individually wrapped in VCI anti-rust paper, packed in a WNRLN branded color box with shock-proof foam insert, and shipped in export-grade corrugated cartons.