The Honda Genuine Shaft, Counter (Part No. 23421K0P600) is a factory-original internal transmission gear component engineered specifically for Honda’s fuel-injected (PGM-FI) BS6 generation of automatic scooters. Positioned securely inside the sealed rear final drive gearbox casing, this precision-machined intermediate countershaft works within a reduction gear train. It meshes directly between the high-speed input driveshaft (driven by the rear CVT pulley) and the final output gear shaft to step down engine RPM, multiplying structural wheel torque to smoothly drive the rear wheel forward under heavy loads.
As showcased in the clean structural profile in image_d50576.png and verified by the official Honda genuine retail packaging label in image_d502b1.png, this OEM component features an integrated counter gear wheel cut onto a solid, case-hardened steel axle. Choosing an authentic Honda factory spare over generic replacement gears guarantees flawless tooth-meshing profiles, eliminates noisy transmission whining, and protects adjacent internal gearbox bearings from devastating uneven load wear.
Key Features:
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100% Honda Genuine Spares: Authentic factory-original final drive transmission component manufactured to meet strict HMSI structural strength and balancing tolerances.
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Precision-Cut Helical Gear Teeth: Engineered with a mathematically optimized helical tooth profile, visible in image_d50576.png, to ensure smooth sliding contact, quiet operation, and immense torque load capacity.
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Case-Hardened Forged Alloy Steel: Heat-treated to maximum industrial hardness levels to resist tooth pitting, chipping, or micro-cracking under intense stop-and-go acceleration forces.
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Concentric High-RPM Balancing: Milled to micron-level accuracy to prevent shaft wobble or high-frequency vibrations from destabilizing the rear subframe assembly at cruising speeds.
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Flawless Oil Film Retention: Surface finish is calibrated to maintain an optimal lubricating oil film, minimizing mechanical friction losses and keeping gearbox operating temperatures low.
Technical Specifications:
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Brand: Honda Genuine Parts (HMSI)
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Part Number: 23421K0P600
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Component Type: Shaft, Counter (Final Drive Intermediate Reduction Gear / Countershaft)
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Material: Forged High-Tensile Case-Hardened Steel Alloy
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Country of Origin: India
Scooter Compatibility
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Honda Activa 6G (BS6): Standard factory replacement for all variants (Standard, Deluxe, and H-Smart editions) utilizing the updated 110cc fuel-injected engine and gearbox layout.
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Honda Dio BS6: Fully compatible with modern fuel-injected 110cc automatic Dio variants sharing this updated K0P final drive reduction gear geometry.
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Compatibility Note: This countershaft is engineered with the unique gear tooth count and shaft spacing dimensions meant strictly for BS6 emission-era gearboxes. It will not fit legacy carbureted models (Activa 3G, 4G, or 5G), which require older reduction gear series architectures.












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