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420-10T Front Engine Sprocket (20mm) for 110cc–125cc Dirt Pit Bike & ATV
420-10T Front Engine Sprocket (20mm) for 110cc–125cc Dirt Pit Bike & ATV
5.0 / 5.0
(1) 1 total reviews
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Product Overview
Boost the low-end torque of your small-displacement engine with this 420-10T Heavy-Duty Front Sprocket. Designed for 110cc and 125cc horizontal engines, this 10-tooth sprocket is the ideal choice for riders looking for more "punch" out of corners or better climbing power. Crafted with high machining accuracy, it ensures a perfect mesh with your 420-size chain, providing reliable power transfer and precise mechanical timing.
roduct Compatibility
| Component Type | Specification |
| Engine Displacement | 110cc, 125cc (Horizontal Engines) |
| Vehicle Types | Dirt Pit Bikes, Mini Bikes, ATVs, 4-Wheelers |
| Chain Size | 420 |
| Common Brands | Coolster, SSR, Apollo, TaoTao, Piranha |
Specifications
| Feature | Details |
| Tooth Count | 10T (10 Teeth) |
| Shaft Diameter | 20mm |
| Inner Diameter (Gear) | 17.5mm (0.68") |
| Outer Diameter | 45mm (1.77") |
| Chain Pitch | 420 |
| Material | Heat-Treated High-Strength Steel |
Key Features
- Enhanced Low-End Torque: The 10-tooth configuration is optimized for better acceleration and torque, making it perfect for technical trails and off-road mini-bike applications.
- Precision Machining: Manufactured with tight tolerances to ensure the sprocket sits perfectly on the 20mm output shaft, reducing vibration and protecting your engine’s crankshaft.
- Superior Thermal Stability: Engineered to resist high-temperature oxidation, this sprocket maintains its hardness even during prolonged, high-RPM operation in air-cooled engines.
- Wear-Resistant Finish: Treated for high abrasion resistance, the sprocket teeth are built to survive the grit and mud of dirt bike riding without premature rounding or hooking.
- Reliable Power Transmission: Acts as a critical link in your vehicle's drive system, ensuring the transmission of power is smooth, consistent, and accurately timed with the engine's output.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for 110cc–125cc Dirt Pit Bike & ATV. It is best matched to original part number(s) 420-10T. Key physical/spec details from the product data include Chain Size: 420, Tooth Count: 10T (10 Teeth), 10T (10 Teeth). 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 420-10T 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 420-10T, 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): 420-10T. Recheck listed specs such as Chain Size: 420, Tooth Count: 10T (10 Teeth), 10T (10 Teeth). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
Perfect gear for my 428 drive Electric Motor.Good teeth, perfect weight, the extra link and pinch clamp.They even included a little keychain inside the baggie as a bit of extra swag.The sprocket fit on my E-motor perfectly and without any issues and it functions with the chain decently.