The best centrifugal clutch for a small engine is one that matches the crankshaft diameter, keyway, chain size, and intended machine. The GYMMEDS 12-tooth model is suited to #35 chain setups, while the VASHLY and ILONPA models fit #40, #41, or #420 chain applications. For larger 8–16 HP engines, the maXpeedingrods clutch has a 1-inch bore; the WanQiAuto model is designed for specified plate compactors.
| Product | Best For | Key Fitment |
|---|---|---|
| GYMMEDS 12T | #35 chain setups | 3/4-inch bore |
| VASHLY 10T | Single-wheel karts | #40/#41/#420 chain |
| ILONPA 10T | Buyers checking exact bore fit | 3/4-inch bore; chain included |
| maXpeedingrods pulley clutch | Higher-powered engines | 1-inch bore |
| WanQiAuto 5-inch clutch | Specified plate compactors | 3/4-inch bore; V-belt |
GYMMEDS 12-Tooth Clutch For #35 Chain
This clutch has a 3/4-inch bore, a 12-tooth sprocket, and a #35 chain specification. The listing describes fitment for engines with a 3/4-inch crankshaft and 3/16-inch keyway, including Predator 212 and several Honda GC and GX engines. It is also listed for many 2–6.5 HP small engines.
Best for: Builders whose existing drivetrain uses #35 chain and who need a 12-tooth sprocket. The listed construction is high-impact, wear-resistant steel. Check the crankshaft and keyway dimensions before ordering; engine model alone does not confirm fit. Choose another option if your kart uses #40, #41, or #420 chain.
VASHLY 10-Tooth Clutch For #40 Chain
The VASHLY clutch uses a 3/4-inch bore and a 10-tooth sprocket for #40, #41, or #420 chain. Its listing specifies 2–6.5 HP gasoline engines at 2,300 RPM and identifies single-wheel-drive karts with tires no taller than 15 inches as an intended use. The chain is not included.
Best for: Single-wheel go-kart or minibike projects already set up for one of the listed chain sizes. It is a better choice than a #35 clutch when the chain pitch is the deciding factor. Avoid this model if your tire exceeds the stated height guidance or if you need the chain supplied.
ILONPA 10-Tooth Clutch With Chain
This 3/4-inch-bore, 10-tooth clutch is listed for #40, #41, and #420 chain and includes one connecting link. The listing specifies a 12.7 mm chain pitch and an engagement speed of 2,300 ±300 RPM. It names several Honda and Honda-clone engines and certain minibike applications, including Baja MB165 and MB200 models.
Best for: Buyers who want a listed chain link included and can verify the exact shaft size. The product information specifically warns that it is not for a 20 mm bore; confirm the actual bore rather than relying only on an engine’s advertised shaft size. It is also limited to engines up to 6.5 HP as described.
maXpeedingrods 1-Inch Pulley Clutch
This is a pulley-style centrifugal clutch rather than a small sprocket clutch. The listing specifies an 8–16 HP engine range, a 1-inch (25.4 mm) bore, and a 1/4-inch flat keyway. It identifies three-wheelers, ATVs, light transport vehicles, and go-karts as potential applications.
Best for: A small-engine setup that needs the stated larger bore and pulley format. The fitment dimensions differ from the 3/4-inch models above, so it is not a direct substitute for them. Check both the shaft and keyway, and avoid choosing it if your engine has a 3/4-inch crankshaft or requires a chain sprocket.
WanQiAuto 5-Inch Clutch For Plate Compactors
WanQiAuto describes this as a 5-inch single-wheel clutch for GX160 and GX200 engines and specified Wacker VP1340, VP1350, and VP1750 plate compactors. Its specifications include a 3/4-inch bore, 3/16-inch keyway, and 1/2-inch V-belt. The listing states support for power up to 13 HP.
Best for: Owners checking a replacement for the named compactor applications or a compatible V-belt setup. This is not a chain-drive go-kart sprocket clutch. The listing cautions that it does not fit a 20 mm crankshaft, so verify the bore before purchase.
Buying Guide: How To Choose A Small-Engine Centrifugal Clutch
Which shaft and keyway dimensions should I check?
Measure the engine crankshaft and identify its keyway before selecting a clutch. Common specifications in these options include a 3/4-inch bore with a 3/16-inch keyway, or a 1-inch bore with a 1/4-inch keyway. Do not assume that an engine’s model name guarantees compatibility; check the actual shaft dimensions and clutch listing.
How do chain size and tooth count affect the choice?
Match the clutch sprocket to the chain already used by the driven system. The GYMMEDS model is for #35 chain, while the VASHLY and ILONPA models are for #40, #41, or #420 chain. Tooth count is a separate specification: these examples use 10 or 12 teeth. Confirm the required tooth count and chain size for your setup before buying.
Do I need a chain or belt clutch?
Choose a sprocket clutch when the drivetrain uses a compatible chain. Choose a pulley-style clutch when the application calls for a belt. The maXpeedingrods product is a 1-inch-bore pulley clutch; the WanQiAuto model specifies a 1/2-inch V-belt. Neither should be treated as interchangeable with a chain sprocket clutch.
What engine power and application details matter?
Compare the listed engine range and intended equipment with your project. Several sprocket models are described for 2–6.5 HP engines, while the maXpeedingrods option is listed for 8–16 HP and the WanQiAuto product for up to 13 HP. Also check application-specific guidance, such as the VASHLY listing’s tire-height limit and the WanQiAuto model’s named compactor fitment.
Frequently Asked Questions
What does a centrifugal clutch do?
A centrifugal clutch engages the driven system as engine speed rises. The clutch must still match the engine shaft and the drivetrain components.
Can I use a 3/4-inch clutch on a 20 mm crankshaft?
Do not assume it will fit. Some listings specifically exclude 20 mm shafts, so compare the measured shaft diameter with the clutch bore.
Are #40, #41, and #420 chains interchangeable?
The listed products group these chain sizes together, but buyers should verify the chain and sprocket specifications for their specific setup rather than assuming every component is interchangeable.
Does every clutch include a chain?
No. The VASHLY listing says the chain is not included, while the ILONPA listing includes a connecting link. Check the package details for the selected model.