WIN Main Shaft Counter Shaft Kit Motorcycle Gearbox Transmission Parts

High quality WIN main shaft and counter shaft set, precision CNC machined alloy steel transmission parts. Anti-wear, anti-deformation, low noise, direct OEM replacement for WIN motorcycle gearbox repair.

• Premium Alloy Steel Material: Made of high-density alloy steel with professional heat treatment, greatly improving hardness, torsion resistance and impact resistance, effectively preventing shaft bending, deformation and gear tooth breakage.
• CNC High Precision Machining: Each shaft and gear tooth is precisely processed with standard tooth pitch and smooth surface. High coaxiality ensures stable rotation, no jitter or jamming during gear shifting.
• Smooth & Stable Power Transmission: Fix common gearbox problems such as gear jumping, slipping, weak power output and abnormal transmission noise, restore smooth shifting performance.
• Excellent Wear & Oil Resistance: Polished surface with anti-oxidation coating reduces internal friction, resists engine oil corrosion and high temperature aging, extending gearbox service life.
• Perfect OEM Fit: Exact size and structure match the original WIN gearbox, plug-and-play installation without cutting or drilling, saving repair time and cost.

This WIN main shaft and counter shaft assembly is the core transmission part of the motorcycle gearbox, responsible for engine power transmission, gear switching and torque conversion. Original shafts often suffer from tooth wear, shaft deformation, coaxial deviation and rust after long-term use, causing gear jumping, slipping, difficult shifting, gearbox noise and unstable power output.

Our upgraded WIN transmission shafts are manufactured from high-strength alloy steel with integral forging and heat treatment technology. The overall structure features high hardness and strong toughness, effectively resisting high-load pressure and vibration during riding. Precision CNC machining ensures every gear tooth and shaft size meets OEM standards, achieving accurate meshing and smooth rotation.

With fine surface grinding and anti-oxidation protection, these shafts perform well under long-term oil immersion and high-temperature working conditions. They reduce internal friction, lower running noise and avoid premature wear and aging.

Direct replacement design allows easy installation without any modification. It perfectly replaces worn or damaged original shafts, repairs most gearbox shifting and power transmission failures, and restores the original stable and smooth driving performance of WIN motorcycles. Ideal for daily maintenance, engine overhaul and professional repair shop use.