Go Kart Centrifugal Clutch 20mm 12 Tooth | Model 1021

Go kart centrifugal clutch 20 mm 12 tooth dimensions

Go Kart Centrifugal Clutch 20 mm 12T – Micro Bike & Kart Motorcycle Centrifugal Clutch, Model 1021

Dhs. 182.26

Go Kart Centrifugal Clutch – 20 mm Bore, 12 Tooth

This go kart centrifugal clutch has a 20 mm bore and a 12-tooth sprocket, and is made for small engines on go-karts, mini bikes and similar small-engine projects. It is listed as model 1021. The clutch bolts onto the engine's output shaft and sits in line with the chain, as shown in the photo of it fitted to a small engine. Easy Life Markets sells it as a single replacement or upgrade clutch for kart builders and small-engine owners.

A centrifugal clutch lets the engine idle without moving the kart, then engages automatically as the engine speeds up. Inside the drum, weighted shoes are held back by springs. As engine speed rises, the shoes swing outward and grip the drum, which turns the sprocket and drives the chain. When the engine slows, the springs pull the shoes back and the clutch disengages. There is no clutch lever or pedal to operate. You can read more about how a centrifugal clutch works.

What Is Included

1 x centrifugal clutch with 12-tooth sprocket, 20 mm bore

Chain, key, bolt, washer and engine are not listed as included.

Specifications

Product type: Centrifugal clutch for go-kart and mini bike engines
Model: 1021
Bore (shaft size): 20 mm
Sprocket: 12 teeth
Listed applications: Go-kart, mini bike and small-engine motorcycle projects
Color: Black
Quantity: 1
SKU: CJJT156444601AZ

The dimension picture in the product photos shows the drum and sprocket measurements. One photo also shows a 19 mm version for comparison. The item sold on this page is the 20 mm, 12-tooth version.

Checking Fitment

Centrifugal clutches must match the engine's output shaft exactly. Before ordering, please check:

Shaft diameter: measure your engine's crankshaft or output shaft. This clutch has a 20 mm bore and will not fit a 3/4 inch (19.05 mm) or 19 mm shaft correctly, or a larger 1 inch shaft.
Keyway: make sure your shaft has a matching keyway and key.
Chain size: compare the sprocket teeth with your chain. The supplier does not state the chain pitch, so please compare the sprocket with your existing one or ask us before ordering.
Gearing: a 12-tooth drive sprocket gives a particular gear ratio with your axle sprocket. Changing the tooth count changes top speed and acceleration.

Signs Your Clutch Needs Replacing

The kart creeps forward at idle, meaning the clutch is not fully releasing
Slipping, a burning smell or a squealing noise under load
The engine revs up but the kart is slow to move
Worn or broken springs, or shoes that have worn thin
Worn sprocket teeth or a noisy, wobbling drum

Installation Tips

Clean the engine shaft and check it for burrs so the clutch slides on smoothly.
Fit the key into the keyway, slide the clutch on, and secure it with the correct bolt and washer.
Line up the clutch sprocket with the axle sprocket so the chain runs straight.
Set the chain tension so there is a little slack, then check that the chain guard is in place.
Start the engine and check that the kart stays still at idle and moves off smoothly as the engine speeds up.

Always keep hands and loose clothing away from the chain and clutch while the engine is running.

Looking After a Centrifugal Clutch

A dry centrifugal clutch works best when it is kept clean and not overheated. Avoid slipping it for long periods, for example by holding a heavy kart on a steep hill at part throttle. Lubricate the bushing as recommended, check the springs and shoes from time to time, and keep the chain adjusted and oiled.

Why Choose This Clutch

The 20 mm bore and 12-tooth sprocket make this a common size for small kart and mini bike engines, and the automatic engagement keeps driving simple for beginners and younger riders. It is a straightforward replacement when an old clutch starts slipping or dragging.

Choosing the Right Engagement and Gearing

Centrifugal clutches engage at a set engine speed determined by their springs and shoe weights. If a clutch engages too low, a heavy kart may bog down; too high, and it can feel jerky. The supplier does not state the engagement speed of this clutch, so if you are replacing an old one that worked well, compare the two before fitting. For gearing, a small 12-tooth drive sprocket paired with a larger axle sprocket gives stronger acceleration and a lower top speed, which suits most off-road karts and mini bikes, especially with heavier riders.

Who This Clutch Is For

This clutch suits go-kart and mini bike owners, small-engine hobbyists, and builders putting together a new kart who have confirmed their engine shaft is 20 mm.

Common Questions

Will it fit a 3/4 inch shaft? No. This version has a 20 mm bore. Please measure your shaft before ordering.

Which chain does it use? The supplier does not state the chain size. Compare the sprocket with your current one or contact us to check.

Buy the Go Kart Centrifugal Clutch at Easy Life Markets

You can order this go kart centrifugal clutch right here. The current price and availability are shown on this page. Please read our return and refund policy before buying.