Sunline SL-1 Steel Front Countershaft Sprocket (12-Tooth / 520 Pitch) — Part #0326-520-12
$5.00
Sale price
$5.00
Regular price
$29.99
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Sunline SL-1 Steel Front Countershaft Sprocket (12-Tooth / 520 Pitch) — Part #0326-520-12
$5.00
Sale price
$5.00
Regular price
$29.99
Product Overview
The Sunline SL-1 Steel Front Countershaft Sprocket (Part #0326-520-12) is a premium, high-strength replacement engine drive gear manufactured by Sunline and distributed by Parts Unlimited. This heavy-duty 12-tooth front engine sprocket efficiently transfers raw mechanical power directly from the transmission countershaft to the rear wheel configuration via an industry-standard 520-pitch drive chain. Built to meet strict original equipment manufacturer (OEM) dimensional boundaries, it functions as a highly precise, bolt-on replacement or target gearing modification. Downsizing your countershaft configuration with this durable 12T gear layout customizes your final drive ratio, supplying exceptional low-end snap out of corners and explosive out-of-the-hole acceleration on tight tracks.
Technical Specifications
- Brand / Manufacturer: Sunline / Parts Unlimited
- Part Number: 0326-520-12 (Catalog ID: 0326-520-12)
- Product Type: Drive Train / Front Countershaft Engine Sprocket
- Material: Case-hardened, high-grade SCM420 chromoly steel alloy for absolute core hardness and structural toughness.
- Finish: Natural raw treated steel finish featuring oil-immersion protective coatings.
- Size Profile: 12-Tooth (12T) configuration mapped specifically for a 520 final drive chain pitch.
- Fitment Type: Direct OEM replacement slider matching original manufacturer spline clearances.
Key Features & Benefits
- SCM420 Chromoly Matrix: Fabricated from structural steel alloy that resists structural bending, chipping, and accelerated tooth breakdown under intense track conditions.
- Advanced Hobbed Profile: Every single tooth is precision hobbed and drilled rather than cheap surface-stamped. This achieves incredibly narrow assembly tolerances and fluid chain-roller engagement.
- Induction Thermal Hardening: Fully heat-treated to optimize face surface rigidity while maintaining a shock-absorbing internal core to withstand sudden acceleration stresses.
- Drivetrain Preservation: Engineered to maximize contact area along the transmission splines, preventing countershaft rounding and eliminating micro-wobbles that cause output shaft seal leaks.
Confirmed Motorcycle Fitment
This specific spline configuration and 520 chain pitch offset is a confirmed direct fit for the following Japanese small-displacement and motocross platforms:
| Manufacturer | Model | Gearing Context | Chain Pitch / Teeth |
|---|---|---|---|
| Kawasaki | KX250F | Custom Low-End Gearing Shift | 520 Pitch / 12-Tooth |
| Suzuki | RM-Z250 | Custom Low-End Gearing Shift | 520 Pitch / 12-Tooth |