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420-12T Front Engine Sprocket (17mm) for 50cc–150cc Dirt Pit Bike & ATV
420-12T Front Engine Sprocket (17mm) for 50cc–150cc Dirt Pit Bike & ATV
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Product Overview
Optimize your gear ratio with this 420-12T Heavy-Duty Front Sprocket, specifically designed for the standard 17mm output shaft found on most 50cc to 150cc horizontal engines. Crafted from high-grade steel and subjected to specialized heat treatment, this sprocket is built to endure the high-torque demands of off-road riding. Whether you are upgrading a pit bike or repairing an ATV, this 12-tooth configuration offers a perfect balance of low-end torque and mid-range speed.
Product Compatibility
| Component Type | Specification |
| Engine Displacement | 50cc, 70cc, 90cc, 110cc, 125cc, 140cc, 150cc |
| Vehicle Types | Pit Dirt Bikes, Motorcycles, ATVs, 4-Wheelers |
| Chain Pitch | 420 |
| Shaft Fitment | 17mm Countershaft (Standard Small Displacement) |
| Common Engines | Lifan, YX, Zongshen, Loncin, TaoTao |
Specifications
| Feature | Details |
| Model | 420 Style / 12 Teeth |
| Inner Diameter | 17mm (0.67") |
| Mounting Hole Distance | 30mm (1.18") center-to-center |
| Material | Heat-Treated High-Carbon Steel |
| Package Includes | 1 x Sprocket, 1 x Retainer Clip (Holder), 2 x Bolts |
Key Features
- Complete Installation Kit: Unlike standard sprockets, this package includes a free retainer holder and mounting bolts, allowing for a complete and secure installation right out of the box.
- Heat-Treated Steel Construction: The steel is "hot-treated" to increase surface hardness, ensuring the teeth resist rounding and wear even when subjected to the abrasive sand and mud of dirt tracks.
- Precision 12-Tooth Design: Sized for 420 chains, the 12T geometry provides a mechanical advantage that improves acceleration compared to larger sprockets, making it ideal for technical trails.
- Universal 17mm Fitment: Designed to fit the most common small-engine output shafts, featuring a 30mm bolt-hole spacing compatible with standard sprocket locking plates.
- Long-Term Durability: Engineered for high-mileage use, the robust construction maintains its structural integrity under high-RPM operation, reducing chain slap and improving drivetrain stability.
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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) 420-12T. Key physical/spec details from the product data include 420 Style / 12 Teeth, Inner Diameter: 17mm (0.67"), Mounting Hole Distance: 30mm (1.18") center-to-center. 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 420-12T 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 420-12T, 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): 420-12T. Recheck listed specs such as 420 Style / 12 Teeth, Inner Diameter: 17mm (0.67"), Mounting Hole Distance: 30mm (1.18") center-to-center. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.