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420-17T Front Engine Sprocket (20mm) for 50cc–150cc Dirt Pit Bike & ATV
420-17T Front Engine Sprocket (20mm) for 50cc–150cc Dirt Pit Bike & ATV
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Product Overview
Take your vehicle's speed and efficiency to the next level with the 420-17T Extreme Gearing Front Sprocket. Engineered specifically for engines with a 20mm output shaft, this 17-tooth gear is the premier choice for riders wanting to maximize top-end velocity and reduce engine strain during high-speed operation. Precision-machined from high-strength alloy steel, it provides a rock-solid connection that minimizes noise and vibration, delivering a smoother, more refined riding experience on any terrain.
Product Compatibility
| Component Type | Specification |
| Engine Displacement | 50cc, 70cc, 110cc, 125cc, 150cc |
| Vehicle Types | Dirt Pit Bikes, ATVs, 4-Wheelers, Motorcycles |
| Chain Pitch | 420 |
| Shaft Fitment | 20mm Countershaft |
| Common Engines | Lifan, Loncin, YX, Jialing, Zongshen |
| Compatible Brands | SSR, SDG, Baja, TaoTao, Coolster |
Specifications
| Feature | Details |
| Tooth Count | 17T (17 Teeth) |
| Inner Diameter | 20mm (0.78") |
| Chain Size | 420 |
| Material | High-Strength Alloy Steel |
| Finish | Polished, Anti-Corrosive Coating |
| Machining | High-Precision Internal & External Tooth Cutting |
Key Features
- Maximum Speed Optimization: The 17-tooth design is the ultimate "high-speed" configuration for 420-chain systems, significantly increasing top speed while allowing the engine to run at lower, more comfortable RPMs.
- Precision Polished Teeth: Gears are precision-machined and polished to ensure a perfect, seamless connection with the chain, effectively eliminating slippage and reducing mechanical drag.
- High-Strength Alloy Steel: Forged from premium alloy steel, this sprocket is built to withstand extreme torque and abrasive off-road conditions without compromising its structural integrity.
- Whisper-Quiet Operation: The precise internal tooth geometry ensures tighter meshing between the gear and chain, which drastically reduces drivetrain noise and vibration for a better handling feel.
- Exceptional Wear Resistance: Engineered with advanced corrosion and wear resistance, this sprocket is designed to work stably under extreme loads, extending the life of your entire drive system.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for 50cc–150cc Dirt Pit Bike & ATV. It is best matched to original part number(s) 420-17T. Key physical/spec details from the product data include Tooth Count: 17T (17 Teeth), 17T (17 Teeth), Inner Diameter: 20mm (0.78"). Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 420-17T before purchase. For this replacement part, also compare the OEM number, dimensions, connector or mounting style, engine/model year, and product photos.
What models or situations does this part not fit?
Do not order this replacement part for machines outside the listed compatibility, or for units with different OEM numbers, dimensions, mounting points, connectors, or year-specific configurations. If your original part number does not cross-reference with 420-17T, treat the fitment as unconfirmed. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. Confirm OEM/cross-reference number(s): 420-17T. Recheck listed specs such as Tooth Count: 17T (17 Teeth), 17T (17 Teeth), Inner Diameter: 20mm (0.78"). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.