WRP Works Racing Parts Steel Front Countershaft Sprocket (13-Tooth / 428 Pitch) — Part #YB09.413A (93822-13213-00)
$5.00
Sale price
$5.00
Regular price
$19.99
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WRP Works Racing Parts Steel Front Countershaft Sprocket (13-Tooth / 428 Pitch) — Part #YB09.413A (93822-13213-00)
$5.00
Sale price
$5.00
Regular price
$19.99
Product Overview
The WRP Works Racing Parts Steel Front Countershaft Sprocket (Part #YB09.413A) is a premium, competition-spec engine drive gear manufactured by WRP (Works Racing Parts). This heavy-duty 13-tooth front engine sprocket serves as a high-reliability drivetrain anchor, transferring mechanical engine power directly from the transmission countershaft to the rear wheel configuration via a standard 428-pitch drive chain. Engineered as a precision direct original equipment manufacturer (OEM) fitment swap, it is highly sought after by track and trail racers looking to restore original factory tolerances or tweak their final drive gear ratio to maximize low-end throttle snap and corner-exit acceleration.
Technical Specifications
- Manufacturer: WRP Works Racing Parts
- Part Number: YB09.413A (Cross-reference sizing equivalent: 174-17461-30)
- Product Type: Drive Train / Front Countershaft Engine Sprocket
- Material: Premium SCM-435 carbon-free steel with a gas-impregnated, carbon-impregnated core matrix.
- Finish: Induction case-hardened raw steel coating with an ultra-hard anti-friction surface layer.
- Size Profile: 13-Tooth (13T) tooth pattern mapped precisely for a 428 final drive chain pitch.
- Fitment Type: Direct OEM precision-fit bolt-on upgrade slider matching original factory spline clearance dimensions.
Key Features & Benefits
- SCM-435 Carbon-Free Steel: Fabricated from structural chromoly steel featuring an elastic internal core structure that dynamically absorbs severe landing shocks, preventing the teeth from fracturing or snapping under brutal engine torque stress.
-
Self-Cleaning Mud Grooves: CNC-machined relief trenches at the base of every tooth face actively eject packed mud, grit, and track track debris during extreme off-road riding, preventing excessive chain tension spikes and maximizing overall chain lifecycle efficiency.
- Ultra-Hard Carburized Surface: Undergoes a high-tech carbon impregnation treatment that yields a hardened exterior shell layer, significantly lowering frictional drag against the chain rollers and boosting sprocket lifecycle limits.
- Micro-Tolerance Splines: Engineered to meet or exceed strict factory dimensional guidelines, eliminating transmission output shaft micro-play to keep power delivery linear and safeguard engine seals from leaks.
Confirmed Motorcycle Fitment
This application-specific vintage spline architecture and 428 chain pitch offset is a confirmed, direct fit for the following youth off-road racing platforms across 1980 to 1983 model years:
| Manufacturer | Model | Compatible Model Years | Chain Pitch / Teeth |
|---|---|---|---|
| Yamaha | YZ80 (F / G / H / J / K Sub-models) | 1980, 1981, 1982, 1983 | 428 Pitch / 13-Tooth |