If you need a true 7/8-inch-bore go-kart clutch, verify the bore before ordering: the listed products below are primarily 3/4-inch-bore models, not confirmed 7/8-inch options. Among them, the GYMMEDS 10-tooth clutch is best for a #40/41/420 chain setup, while its 12-tooth model is intended for a #35 chain. The VOWAGH pulley clutch is for a belt-drive setup. Check your engine shaft, keyway, chain or belt, and drive layout before choosing.
| Product | Listed bore | Drive fit | Best suited for |
|---|---|---|---|
| GYMMEDS 10-Tooth | 3/4 inch | #40/41/420 chain | Single-wheel-drive kart setups |
| GYMMEDS 12-Tooth | 3/4 inch | #35 chain | Engines with a matching #35 chain |
| VASHLY 10-Tooth | 3/4 inch | #40/41/420 chain | Mini bikes and go-karts |
| Bravex 10-Tooth | 3/4 inch | #40/41/420 chain | 6.5 HP engine applications |
| VOWAGH Pulley Clutch | 3/4 inch | 1/2-inch AB-style belt | Belt-drive equipment |
GYMMEDS 10-Tooth #40/41/420 Clutch
This centrifugal clutch has a 3/4-inch bore, 10 teeth, and is designed for #40, #41, or #420 chain. The listing describes it for single-wheel-drive karts with tires no taller than 15 inches. It also specifies a 3/16-inch keyway and lists 2–6.5 HP engines, including Predator 212 and several Honda-style engines.
Best for: A buyer whose kart uses the specified chain sizes and a 3/4-inch crankshaft. It was selected for its clearly stated chain and engine fitment. Limitation: It is not listed as a 7/8-inch-bore clutch, and the tire-height guidance may not suit every kart configuration.
GYMMEDS 12-Tooth #35 Chain Clutch
This model pairs a 3/4-inch bore and 12-tooth sprocket with a #35 chain. The listing calls out a 3/16-inch keyway and names Predator 212, Honda GC and GX engines, and other small engines in the stated power range. Its listed construction is high-impact, wear-resistant steel.
Best for: A go-kart or minibike already set up for #35 chain, where the shaft and keyway match. Choose it over the 10-tooth model if your existing chain is #35. Limitation: It is not interchangeable with #40/41/420 chain setups based on the listed chain specification, and its bore is 3/4 inch rather than 7/8 inch.
VASHLY 10-Tooth Chain Clutch
The VASHLY centrifugal clutch has a 3/4-inch bore and a 10-tooth sprocket for #40/41/420 chain. Its listing identifies 2–6.5 HP, 2300 RPM gasoline engines and applications such as go-karts, minibikes, generators, and garden tractors. The chain is not included.
Best for: Buyers replacing a 10-tooth clutch in a compatible chain-driven setup who can reuse or source the correct chain separately. It was selected as a straightforward alternative in the same chain category as the GYMMEDS 10-tooth model. Limitation: The chain is not included, and the listed bore is not 7/8 inch.
Bravex 10-Tooth Centrifugal Clutch
Bravex lists this clutch as a 3/4-inch-bore, 10-tooth model for #40/41/420 chain. The stated applications include go-karts, minibikes, fun karts, lawnmowers, and 6.5 HP engines. The product description identifies high-impact, wear-resistant steel and claims a longer service life, but provides no comparison details for that claim.
Best for: A buyer seeking a basic 10-tooth replacement for a matching 3/4-inch shaft and chain. It was selected because its stated chain and engine applications cover common small-engine kart setups. Limitation: Confirm the shaft and keyway dimensions independently; the supplied features do not give a keyway measurement.
VOWAGH Belt-Drive Clutch Pulley
This product differs from the chain sprocket clutches above. It is a centrifugal clutch pulley with a 3/4-inch bore, designed for a 1/2-inch AB-style belt. The listing names some Carter go-karts, minibikes, and wood chippers with engines up to 6.5 HP.
Best for: A belt-drive machine whose existing pulley and belt match the stated dimensions. It was selected to cover buyers who need a pulley-style clutch rather than a chain sprocket. Limitation: It is not a chain-drive clutch and is not listed for a 7/8-inch shaft.
Buying Guide: How to Choose a Go-Kart Clutch
Does the clutch bore match the engine shaft?
Measure the engine crankshaft before ordering. These five products specify a 3/4-inch bore, so they should not be treated as 7/8-inch replacements. Also check the shaft’s keyway size and length, because the shaft and key must fit the clutch correctly.
Which chain or belt does your kart use?
Match the clutch’s drive component to the existing drivetrain. The GYMMEDS 12-tooth model is specified for #35 chain; the listed 10-tooth chain models use #40/41/420 chain. The VOWAGH model uses a 1/2-inch AB-style belt. These drive types are not substitutes for one another.
Should you choose 10 or 12 teeth?
Start with the chain standard and current sprocket setup, not tooth count alone. The 12-tooth option in this list is for #35 chain, while the 10-tooth options are for #40/41/420 chain. Tooth count can affect gearing, so verify the kart’s existing setup and intended use before changing sprockets.
What else should you verify?
Check engine power range, crankshaft diameter, keyway, chain alignment, and available clearance. A listing’s engine examples do not replace measurements of your actual engine and frame. If you specifically require a 7/8-inch bore, continue searching for a product that explicitly states that measurement.
Frequently Asked Questions
Are any of these clutches confirmed to have a 7/8-inch bore?
No. The five selected listings specify a 3/4-inch bore. They should not be purchased as confirmed 7/8-inch-bore replacements.
Can a #35-chain clutch run a #40/41/420 chain?
The listed GYMMEDS 12-tooth clutch is specified for #35 chain. Choose a clutch that explicitly matches the chain standard used by your kart.
Does the VASHLY clutch include a chain?
No. Its listing says the chain is not included.
Is the VOWAGH clutch a chain sprocket clutch?
No. It is a pulley-style clutch designed for a 1/2-inch AB-style belt.
What should I measure before buying?
Measure the crankshaft diameter and check the keyway, then identify the chain or belt type and confirm engine fitment. For a 7/8-inch shaft, select a clutch listing that explicitly specifies a 7/8-inch bore.