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420-17T High-Speed Front Engine Sprocket (17mm) for 50cc–110cc Pit Bike & ATV
420-17T High-Speed Front Engine Sprocket (17mm) for 50cc–110cc Pit Bike & ATV
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Product Overview
Experience a smoother ride and increased top-end velocity with the 420-17T High-Performance Front Sprocket. Engineered for the standard 17mm countershaft found on most small-displacement horizontal engines, this 17-tooth gear is the ideal choice for riders who want to "gear up." By increasing the tooth count, you reduce engine screaming at high speeds and gain a much higher cruising velocity. This sprocket is manufactured using precision processing technology to ensure a silent, efficient, and direct power transfer.
Product Compatibility
| Component Type | Specification |
| Engine Displacement | 50cc, 70cc, 90cc, 110cc |
| Vehicle Types | Dirt Pit Bikes, ATVs, Motorcycles, Mini Bikes |
| Chain Pitch | 420 |
| Shaft Fitment | 17mm Countershaft |
| Gearing Change | High-Speed Upgrade (Replaces 10T, 12T, 14T) |
Specifications
| Feature | Details |
| Tooth Count | 17T (17 Teeth) |
| Inner Diameter | 17mm (0.67") |
| Mounting Hole Distance | 30mm (1.20") center-to-center |
| Chain Size | 420 |
| Material | Hot-Treated High-Strength Steel |
| Installation | Direct Fit (Includes Retainer Kit) |
Key Features
- High-Speed Gearing Optimization: The 17-tooth design significantly lowers engine RPM at high speeds, providing a higher top-end velocity and a more relaxed engine tone for trail or road cruising.
- Hot-Treated Durability: Crafted from steel subjected to advanced heat treatment, this sprocket features superior surface hardness that resists tooth "hooking" and wear over long-term use.
- Precision Transmission Technology: Utilizes modern processing techniques to ensure perfectly symmetrical teeth, resulting in a more silent drive system and reduced vibration compared to standard stamped sprockets.
- Complete "Direct Fit" Kit: Comes with all necessary accessories for a direct installation. There is no need for additional specialized tools—simply swap it with your existing 17mm sprocket.
- Rust and Wear Resistance: The steel construction is designed to withstand the harsh conditions of off-road riding, including exposure to mud, silt, and high-temperature operation.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for 50cc–110cc 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: 17mm (0.67"). 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: 17mm (0.67"). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.