This is one essential part of a go kart that you shouldn't just ignore. The clutches available are the centrifugal clutches that are very cheap and absolutely reliable. Those type of clutches operate at a single gear ratio. There are also variable speed torque converters that serves as automatic transmission. There are cheaper ones and the heavy-duty but more expensive ones. You just have to choose what you think is best.

Max Torque 11 tooth Go Kart Clutch 5 8 bore NEW
Max Torque 11 tooth Go Kart Clutch 5 8 bore NEW
Paypal   US $28.50
Hilliard Extreme Duty Go Kart Clutch NEW
Hilliard Extreme Duty Go Kart Clutch NEW
Paypal   US $41.00
GY6 Scooter ATV Go Kart 150cc rear clutch Kinroad Baja
GY6 Scooter ATV Go Kart 150cc rear clutch Kinroad Baja
Paypal   US $33.20
Comet Gocart Minibike 3 4 Br 41 Chain Clutch 209768A
Comet Gocart Minibike 3 4 Br 41 Chain Clutch 209768A
Paypal   US $39.99
Clutch Assembly GY6 150cc Moped Gokart ATV Quad
Clutch Assembly GY6 150cc Moped Gokart ATV Quad
Paypal   US $39.99
Go Kart Parts Minibike 3 4 Bore Clutch Chain 35
Go Kart Parts Minibike 3 4 Bore Clutch Chain 35
Paypal   US $37.99
125 150cc GY6 ATV Scooter Go Kart Clutch
125 150cc GY6 ATV Scooter Go Kart Clutch
Paypal   US $33.20
150cc GY6 Variator and Clutch Set ATV Scooter Go Kart
150cc GY6 Variator and Clutch Set ATV Scooter Go Kart
Paypal   US $61.70
MINIBIKE GO KART GOCART PARTS 3 4 BORE CLUTCH 35
MINIBIKE GO KART GOCART PARTS 3 4 BORE CLUTCH 35
Paypal   US $32.99
MINIBIKE GO KART GOCART PARTS  3 4 CLUTCH CHAIN41
MINIBIKE GO KART GOCART PARTS 3 4 CLUTCH CHAIN41
Paypal   US $38.99
Go Kart Mini Bike Max Torque Belt Drive Clutch 3 4
Go Kart Mini Bike Max Torque Belt Drive Clutch 3 4
Paypal   US $59.95
Go Kart Mini Bike Max Torque Belt Drive Clutch 3 4
Go Kart Mini Bike Max Torque Belt Drive Clutch 3 4
Paypal   US $59.95
Clutch Assembly GY6 150cc Moped Gokart ATV Quad
Clutch Assembly GY6 150cc Moped Gokart ATV Quad
Paypal   US $39.99
New 3 4 Clutch 41 Chain Go Kart Mini Bike
New 3 4 Clutch 41 Chain Go Kart Mini Bike
Paypal   US $44.99
MINIBIKE GO KART GOCART PARTS 3 4 BORE CLUTCH 35
MINIBIKE GO KART GOCART PARTS 3 4 BORE CLUTCH 35
Paypal   US $32.99
MINIBIKE GO KART GOCART PARTS  3 4 CLUTCH CHAIN41
MINIBIKE GO KART GOCART PARTS 3 4 CLUTCH CHAIN41
Paypal   US $38.99
Vintage Hartman Go Kart Clutch
Vintage Hartman Go Kart Clutch
Paypal   US $120.00
50 70 90 110 125 CC 110CC ATV GO KART CLUTCH DISC PLATE
50 70 90 110 125 CC 110CC ATV GO KART CLUTCH DISC PLATE
Paypal   US $7.99
Go Kart Parts Minibike 3 4 Bore Clutch Chain 35
Go Kart Parts Minibike 3 4 Bore Clutch Chain 35
Paypal   US $37.99
150cc Clutch GY6 ATV Go Kart Scooter Roketa NST Tank
150cc Clutch GY6 ATV Go Kart Scooter Roketa NST Tank
Paypal   US $33.20
MINIBIKE GO KART GO CART PARTS 3 4 CLUTCH CHAIN35
MINIBIKE GO KART GO CART PARTS 3 4 CLUTCH CHAIN35
Paypal   US $38.99
Scooter ATV Go Kart Clutch Kinroad 150cc Chinese Parts
Scooter ATV Go Kart Clutch Kinroad 150cc Chinese Parts
Paypal   US $34.95