Sunstar Steel Front Countershaft Drive Sprocket (12-Tooth / 420 Pitch) — Part #10612
$5.00
Sale price
$5.00
Regular price
$19.99
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Sunstar Steel Front Countershaft Drive Sprocket (12-Tooth / 420 Pitch) — Part #10612
$5.00
Sale price
$5.00
Regular price
$19.99
Product Overview
The Sunstar Steel Front Countershaft Drive Sprocket (Part #10612) is a premium, high-strength replacement engine gear manufactured by Sunstar, the world’s leading supplier of original equipment (OEM) motorcycle sprockets. This 12-tooth front sprocket anchors your motorcycle's primary drive system, efficiently transferring mechanical engine power directly from the transmission countershaft to the rear wheel configuration via a standard 420-pitch drive chain. Engineered as an exact OEM substitute, it functions as a highly precise, bolt-on replacement or standard gearing modification designed to preserve linear power delivery and optimize drivetrain longevity.
Technical Specifications
- Manufacturer: Sunstar
- Part Number: 10612 (OEM Cross-Reference: 23800-045-671)
- Product Type: Drive Train / Front Countershaft Engine Sprocket
- Material: Premium-grade, case-hardened chromium molybdenum steel for maximum structural toughness.
- Finish: Specialized "Parkerizing" chemical surface treatment for superior rust and corrosion resistance.
- Size Profile: 12-Tooth (12T) configuration mapped precisely for a 420 final drive chain pitch.
- Fitment Type: Direct OEM precision-fit bolt-on upgrade slider matching original countershaft splines.
Key Features & Benefits
- Case-Hardened Steel Construction: Manufactured using specialized heat treatment processing that raises external surface hardness to resist tooth rounding, face pocket wear, or gear tooth breakdown under severe racing stresses.
- Parkerized Outer Coating: Coated with an advanced anti-corrosive layer that won't degrade over time, safeguarding the sprocket against harsh weather, moisture, road salt, and contaminants.
- Micro-Tolerance Splines: Engineered with computer-aided design (CAD) tolerances to completely eliminate countershaft micro-play, keeping power distribution completely linear and defending transmission output shaft seals from leaks.
- OEM-Trusted Quality: Offers the exact same performance standards, materials, and build parameters that major Japanese motorcycle manufacturers have trusted since 1946.
Confirmed Motorcycle Fitment
This specific spline configuration and 420-12T layout is a confirmed direct fit for the following classic Honda mini-bikes and youth off-road platforms:
| Manufacturer | Model | Compatible Model Years | Gearing Context |
|---|---|---|---|
| Honda | Z50A Mini Trail | 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978 | Stock Gearing / Replacement |
| Honda | Z50R | 1979, 1981 | Stock Gearing / Replacement |
| Honda | MR50 Elsinore | 1974, 1975 | Off-Road Final Drive |