ATV Chain and Sprocket Kit Guide: Keeping Your 110cc, 125cc, and 150cc Chinese ATV Running Smooth

Shea McCombs @ Jun 30, 2026

Chinese 110cc, 125cc, and 150cc ATVs are reliable and affordable machines when they are properly maintained. Of all the routine maintenance tasks an owner will face, drivetrain upkeep sits near the top of the list. The chain and sprocket system transfers power from the engine to the rear wheel on every single ride. When it begins to wear, the effects show up quickly in the form of reduced performance, unusual noise, and eventually a loss of drive entirely.

At Get 2 It Sales, we supply drivetrain parts for all major Chinese ATV brands, and the questions we receive most often come from riders who are unsure when to replace their chain, how to size a replacement correctly, or whether their specific brand requires anything different. This guide answers all of those questions and more.

How the Chain and Sprocket System Works

The drive chain on a Chinese ATV connects a small front sprocket, mounted on the engine output shaft, to a larger rear sprocket mounted on the rear axle. As the engine turns, the chain transfers that rotation to the rear wheel. The ratio between the front and rear sprocket tooth counts determines how aggressively the ATV accelerates and how high its top speed can be.

On most Chinese 110cc to 150cc ATVs, the front sprocket runs between 11 and 14 teeth while the rear sprocket typically runs between 37 and 42 teeth. This spread gives a strong low-end pull suited to off-road and recreational riding. The chain itself is rated by pitch, which is the distance between pin centers. Most 110cc to 150cc Chinese ATV parts use a 420-pitch chain as standard, though some models use 428. Confirming your pitch before ordering is the single most important fitment step.

Rider sitting on a quad ATV in an urban area

Signs Your Chain and Sprocket Need Replacing

Wear on a drive chain and sprocket set is gradual, which means many riders do not notice the problem until performance has already degraded significantly. Knowing the early signs saves time and prevents more expensive secondary damage.

• Chain slack that cannot be adjusted out — when you have reached the end of your adjuster range, and the chain is still loose, it is time to replace it.

• Visible tooth wear on the sprockets — healthy sprocket teeth are symmetrical and pointed. Worn teeth develop a hooked or shark-fin profile that accelerates chain wear and increases the risk of skipping under load.

• Chain kinking or stiff links — a chain that does not flow smoothly over the sprocket is already past its service life.

• Noise under load — a rattling, slapping, or grinding sound from the rear of the ATV under acceleration is a strong indicator of drivetrain wear.

• Visible rust or corrosion on chain links — particularly common on machines that are stored outdoors or ridden in wet conditions without proper lubrication.

The most important rule when replacing a worn drivetrain is to always replace the chain and both sprockets together. A new chain on worn sprockets will accelerate its own wear dramatically. A worn chain on new sprockets will damage the new teeth before they have a chance to break in. A matched kit replacement is always the correct approach.

Sizing Your Replacement: What to Measure

The correct ATV chain and sprocket kit for your machine depends on four specifications: chain pitch, chain link count, front sprocket tooth count, and rear sprocket tooth count. Each of these needs to be confirmed against your specific model before ordering.

• Chain pitch — measure the distance between three consecutive link pins and divide by two. For most 110cc, 125cc, and 150cc Chinese ATVs, this will be 420 (half-inch pitch) or 428 (slightly wider).

• Link count — count the total number of links in the existing chain. Common counts for Chinese youth and recreational ATVs range from 96 to 108 links, depending on swingarm length and chain routing.

• Front sprocket — check the tooth count stamped on the face of the sprocket and confirm the spline bore size matches your output shaft.

• Rear sprocket — measure the bolt circle diameter (the circle drawn through the mounting bolt holes) and confirm the tooth count and center bore diameter.

If the existing chain and sprockets are too worn to measure accurately, your owner's manual or a parts diagram for your specific model is the next best reference. At Get 2 It Sales, we maintain brand-specific parts catalogs that list the correct specifications for each model we support.

Brand Compatibility: TaoTao and Coolster

Two of the most common Chinese ATV brands in the U.S. market are TaoTao and Coolster, and both use similar drivetrain configurations. TaoTao ATV parts across the 110cc to 150cc lineup are generally compatible with standard 420 chain and sprocket kits, and the brand's models from recent years have consistent sprocket bolt patterns that make fitment straightforward.

Coolster ATV replacement parts follow a similar pattern. Many Coolster ATV models in the 110cc to 150cc range use a 420 pitch chain as standard, and rear sprocket bolt circle dimensions are consistent across most models in the lineup. One thing to verify with Coolster specifically is the output shaft diameter on the front sprocket, as this can vary slightly between older and newer production runs.

For both brands, we strongly recommend confirming the tooth counts and chain pitch from the existing drivetrain before ordering, rather than relying solely on the model name. Minor production variations do exist, and taking five minutes to measure prevents the need for a return and reorder.

Installation Tips

Replacing a chain and sprocket kit is a job most ATV owners can complete at home with basic tools. Here is what the process involves and where riders most often run into issues.

• Remove the rear wheel before attempting to access the rear sprocket. Working with the wheel in place makes bolt access difficult and increases the risk of damaging the new chain during installation.

• Inspect the output shaft and rear axle for wear or damage before installing new sprockets. Damaged splines or a worn axle keyway will cause a new sprocket to fail prematurely.

• Thread the new chain through the swingarm and over both sprockets before connecting the master link. Trying to shorten the chain after it is installed is unnecessarily difficult.

• Install the master link clip with the closed end facing the direction of chain travel. An incorrectly oriented clip can work loose under load.

• Set the initial chain tension with 10 to 20mm of vertical play at the midpoint between sprockets. Re-check tension after the first few rides, as a new chain will seat and stretch slightly during break-in.

Regular lubrication after every few rides significantly extends chain life. A thin, even coat of chain lube applied to the inner faces of the links while the chain is still warm from riding provides the best penetration. For riders who maintain their ATVs well, pairing the new drivetrain with a fresh set of ATV brake pads and Chinese replacement parts is a sensible all-in-one maintenance step that covers the most critical wear items in a single order.

Ready to Order the Right Kit? Get 2 It Sales Can Help.

Finding the correct chain and sprocket kit for a Chinese ATV should not require hours of research. At Get 2 It Sales, our catalog is organized by brand and model, so you can find the right drivetrain kit without guessing at specifications or wading through incompatible listings.

We stock affordable Chinese ATV replacement parts for TaoTao, Coolster, Apollo, SSR, Roketa, and more — and every incoming shipment is inspected before it enters our inventory to make sure parts match their listed specifications. That means when you order from us, you get the kit described, not a surprise.

Our team has nearly 100 years of combined experience in Chinese powersports. If you are unsure which kit fits your specific model, or if you need help confirming chain pitch or sprocket specs, we are here to help. Reach out through our contact page with your ATV brand, model, and year, and we will point you to the correct replacement.