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428-19T Front Engine Sprocket (17mm) for 50cc–125cc Pit Bike & ATV
428-19T Front Engine Sprocket (17mm) for 50cc–125cc Pit Bike & ATV
5.0 / 5.0
(2) 2 total reviews
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Product Overview
The 428-19T Front Sprocket is the ultimate gearing solution for riders who want to push their small-displacement engines to their absolute top-end potential. Designed for the standard 17mm countershaft, this massive 19-tooth sprocket drastically changes your gear ratio, allowing for much higher cruising speeds and significantly lower engine vibration. Crafted from hot-treated steel and built for the heavy-duty 428-series chain, it provides the strength and stability needed for high-velocity operation on go-karts, mini-bikes, and ATVs.
Product Compatibility
| Component Type | Specification |
| Engine Displacement | 50cc, 70cc, 90cc, 110cc, 125cc |
| Vehicle Types | Dirt Pit Bikes, ATVs, Go Karts, 4-Wheelers |
| Chain Pitch | 428 (Heavy Duty) |
| Shaft Fitment | 17mm Countershaft |
| Common Brands | TaoTao, SSR, Apollo, Lifan, YX, Zongshen |
Specifications
| Feature | Details |
| Model | 428 Style / 19 Teeth |
| Inner Diameter | 17mm (0.67") |
| Mounting Hole Distance | 30mm (1.18") center-to-center |
| Chain Size | 428 |
| Material | Hot-Treated High-Strength Steel |
| Package Includes | 1 x Sprocket, 1 x Locking Holder, 2 x Bolts |
Key Features
- Maximum Speed Upgrade: The 19-tooth configuration is one of the largest sizes available, offering a significant boost in top-end velocity. It is perfect for long-distance cruising or flat-track racing where high speed is the priority.
- Vibration Reduction: By increasing the tooth count, you allow your 110cc or 125cc engine to maintain speed at a much lower RPM, resulting in a smoother ride with less "screaming" from the engine.
- Hot-Treated Steel Construction: The steel is thermally hardened to provide exceptional durability, ensuring the sprocket can handle the heat and friction of sustained high-speed chain engagement.
- Complete Installation Kit: This package includes a free retainer holder and mounting bolts, providing everything you need for a direct installation without the need for additional hardware.
- Robust 428 Design: Sized specifically for 428 chains, this sprocket features thicker, stronger teeth than standard 420 versions, offering superior reliability for high-performance builds.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for 50cc–125cc Pit Bike & ATV. It is best matched to original part number(s) 428-19T. Key physical/spec details from the product data include 428 Style / 19 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 428-19T 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 428-19T, 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): 428-19T. Recheck listed specs such as 428 Style / 19 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.
Using this on my go kart to go up from a 13t to 19t. The electric motor has plenty of low end already, and I was approaching the smallest size I could do on the axle, so I needed to go bigger on the motor. Fits perfectly on a Siacosys QS138 90H V3 motor with the built in gear reduction.I reused my original motor bolts since the thread quality looked better and they were zinc coated. The included bolts probably be fine though.
Strong and beautiful steel gear, holds up to insane amounts of abuse. The gear has lasted longer than the master-link it comes with, please do not use the master-link that came with this package because my chain popped and thankfully only fell onto the road. It didn't become a bullet like usually happens with catastrophic chain failures.