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Centrifugal Clutches

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Comet Torque Converters: Comet Drive Belts, Clutches & Parts . Home . Parts Catalog

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Go Kart Clutches and Mini Bike Clutches

Centrifugal Clutches

Max Torque Centrifugal Clutches with Keyway
Available for 3/4" or 5/8" Bore Engine Crankshafts

Part Number Description Brand Key Type Price Add to Shopping Cart
04-455 CLUTCH 3/4"B 12TOOTH #35 CHAIN 3/4" BORE
MAX TORQUE
KEYWAY 36.50
04-457 CLUTCH 3/4"B 10TOOTH 40/41/420 3/4" BORE
MAX TORQUE
KEYWAY 36.50
04-456 CLUTCH 5/8"B 11TOOTH #35 CHAIN 5/8 BORE
MAX TORQ
KEYWAY 36.50
04-458 CLUTCH 5/8"B 10TOOTH 40/41/420 5/8 BORE
MAX TORQUE
KEYWAY 36.50
All of these clutches require an engine crankshaft with a 3/16" keyway. They perform clockwise or counter-clockwise, with the sprocket teeth inboard or outboard . 4" OD, height 2-1/4" . The 10 tooth clutches use #40,#41 & #420 chain. The 11 & 12 tooth clutches use #35 chain only.

Clutches Builtin Key

Comet Brand Centrifugal Clutches, Built In Key
Available for 3/4" or 5/8" Bore Engine Crankshafts

Part Number Description Brand Key Type Price Add to Shopping Cart
209760A CLUTCH 3/4"B 12TOOTH #35 CHAIN 3/4" BORE
COMET
BUILT IN KEY 39.50
209768A CLUTCH 3/4"B 10TOOTH 40/41/420 3/4" BORE
COMET
BUILT IN KEY 39.50
Comet Clutches require an engine crankshaft with a 3/16" keyway that goes all the way out to the end of the crankshaft. They perform clockwise or counter-clockwise, with the sprocket teeth inboard or outboard . 4" OD, height 2-1/4" . The 10 tooth clutches use #40,#41 & #420 chain. The 12 tooth clutches use #35 chain only.

Hilliard's Clutches

Hilliard's Extreme Duty
Centrifugal Clutches For 3/4" Crankshafts

Part Number Description # Teeth Price Add to Shopping Cart
04-10389 CLUTCH EXTREME DUTY #35 CHAIN 12 52.50
04-10390 CLUTCH EXTREME DUTY #40/41/420 10 52.50

The Extreme-Duty Sprocket Centrifugal Clutch is ideal for the everyday demands of go-karts and youth-model snowmobiles. It has been engineered to provide long service life even in the most demanding applications. A thermodynamically designed clutch shoe increases the clutch’s capacity to absorb heat without damaging the clutch springs, resulting in longer life and better reliability. This Extreme Duty centrifugal clutch can handle higher temperatures to offer longer life. Bi-Directional, they can run clockwise or counter clockwise. Disapates heat better, extending clutch life. Built in internal keyway. Requires a tapped engine crankshaft.

Install a bolt and washer on the end of the engine crankshaft. Use a washer that measures at least 1 1/16” inches on the outside diameter. On this LD4S-“L” long bushing series clutch there is a retaining ring to retain the bronze bearing in the sprocket drum. A bolt and washer are used to retain the hub on the crankshaft. Make sure that the bronze bushing has a minimum of 1/32” inch of movement on the crankshaft of the engine, and not more than 1/16”. While tightening the bolt be sure to torque the bolt to the engine manufacturers specifications. To tighten the bolt you will need to make sure that the ignition is in the off position, to ensure that the engine won't start. Next, get the bolt tight to the point that you are turning over the motor while tightening the bolt. Then MAKE sure the ignition is off, and pull the pull starter just out far enough to catch the motor. Then continue to tighten the bolt to the proper specification, holding the pull starter out, you will feel the engine want to pull the started cord back in, you need to hold it out until you get the bolt tight. For cases where there is no pull starter, you will need to find a way to stop the crankshaft from turning over.
Verify proper alignment of the sprockets and install the chain according to your owner’s manual. Over-tightening the chain or having the chain too slack will cause premature sprocket and bushing wear.
Oil the clutch bushing every 4 hours of use. Try to get the oil in between the housing and the bushing. Removal of the bushing from the sprocket is the best way to ensure proper lubrication.

Max Lube Clutch System for 3/4" Crankshafts

Max Lube Clutches

3/4" Bore Max Lube Centrifugal Clutches

Part Number Description Chain Size Price Add to Shopping Cart
04-7680 CLUTCH MAX LUBE 12 TOOTH #35 CHAIN 46.50
04-7681 CLUTCH MAX LUBE 10 TOOTH #40,41,420 46.50
The Zerk Bolt Kit (shown below) is Included

Developed in conjunction with Chuck Brister, a major kart manufacturer in Louisiana, to address one of the most frequent problems with fun karts - lubrication of the clutch bushing. This lube system supplies lubrication directly to the clutch bushing through the keyway of the engine crankshaft utilizing a special zerkbolt fitting which is available only from Max-Torque. Since its introduction in 1992, lubrication problems have been dramatically reduced.
Check to be sure that your Briggs & Stratton or Tecumseh engine has a drilled and tapped hole in the end of the crankshaft. The size of the hole should be 5/16" x 24 threads per inch. If your engine does not have this hole, the MAX-LUBE clutch cannot be used.

Tools Required to Drill Cranshaft: Electric drill, 1/8"drill bit, Ruler, Hammer, Center punch, 1/2"open end wrench
Max-Torque Supplied Parts: Clutch with built-in key, 5/16" x 24 TPI Zerkbolt and washer and Two 3/4" diameter fibre washers.
Installation Instructions: Examine the SIDE VIEW and TOP VIEW diagrams above. Remove the old clutch from the crankshaft. Disconnect the spark plug lead and slowly pull the starter handle until the crankshaft keyway is facing upward. Use a ruler to measure a point approximately 7/8" from the outboard end of the crankshaft to the center of the keyway. As shown in the diagram, the width of a nickel will also provide this dimension. Once this point is located use the center punch with a firm hit to make an indentation in the center of the crankshaft keyway. Drill a 1/8" hole at this indentation until the drill bit breaks through the crankshaft bolt hole cavity. Stop drilling. Blow out this 1/8" hole to remove any chips that might remain from the drilling operation. Place the two fibre washers onto the crankshaft, slide the clutch on the crankshaft and secure the clutch with the Zerkbolt and washer. CAUTION: Do not over-tighten the Zerkbolt as the hex head will snap off. No more than 15 ft*lbs of torque should be used in tightening the bolt! Using a grease gun give the Zerkbolt a full pump of grease. Replace the chain on the clutch sprocket and replace the chain guard.
Other Operating and Use Instructions: Grease the Zerkbolt, with one squirt, after each week of operation. Avoid or eliminate incorrect gearing. The gear ratio between the clutch sprocket and the drive sprocket should be 1 to 6. For example, if your kart has a 12 tooth clutch sprocket the drive sprocket should have 72 teeth. A 10 tooth clutch sprocket would require a 60 tooth drive sprocket. Tires with a diameter exceeding 15 inches tall should not be used. If any of these suggestions are not followed, the clutch will not operate properly and clutch life will be significantly reduced.

Max Lube Tool

Max Lube Drill Aligning Tool
Used for drilling a keyway in crankshafts

Part Number Description Price Add to Shopping Cart
32-7682 MAX LUBE DRILL ALIGNING TOOL 24.95
Zerk Bolt Kit

Zerk Bolt Kit for Max Lube Clutch

Part Number Description Price Add to Shopping Cart
04-8489 GREASE ZERK BOLT ASSEMBLY 7.95
Grease Zerk Bolt Assy Fits Part #04-7680 & 04-7681


Centrifugal Pulley Clutches


Max-Torque Belt Drive Centrifugal Clutches

Part Number Description Price Add to Shopping Cart
04-864 PULLEY CLUTCH 3/4 BORE 54.50
04-865 PULLEY CLUTCH 5/8 BORE 54.50
Used with A or B section belts, 3/16" key included

Comet Pulley Clutch

Comet SCP 350 Series
Belt Drive Centrifugal Clutches

Part Number Description Price Add to Shopping Cart
202312A PULLEY CLUTCH 1" BORE S350 96.50
3-1/2" Outer Diameter Clutch, Self Contained Single Pulley, 1/4" key

Clutch Key

3/16" Clutch Keys

Part Number Description Length Price Add to Shopping Cart
8498 KEY 3/16" X 1/2" 1/2" Long 1.50
8454 KEY 3/16" X 3/4" 3/4" Long 1.50
8442 KEY 3/16" X 1-1/4" 1.50

Key Stock

12" Long Sections of Keystock

Part Number Description Price Add to Shopping Cart
04-5600 KEYSTOCK 3/16" X 12" 3.00
04-5601 KEYSTOCK 1/4" X 12" 3.50
Cut as needed.
Use in keyways on crankshafts, pulleys, hubs, etc.

Set Screws

Set Screws For Max Torque Clutches

Part Number Description Price Add to Shopping Cart
02-119 SET SCREW 0.25
AS-1414F 1/4" set screw

Bronze Bushings

Centrifugal Clutch Bushings

Part Number Description Price Add to Shopping Cart
04-465 BRONZE BUSHING 3/4 BORE CLUTCH 3.50
04-466 BRONZE BUSHING 5/8 BORE CLUTCH 3.50
These bushings are an internal clutch part.
They fit inside the clutch, not directly on the engine cranshaft.
Bushing for 3/4" Bore - 7/8" ID .... Bushing for 5/8" Bore - 3/4" ID

Clutch Rebuild Kit

Max Torque Clutch Rebuild Kit

Clutch Rebuild Kit - Sprocket and Bushing

Part Number Description Price Add to Shopping Cart
04-462 11 TOOTH 5/8" BORE #35 REBUILD 14.99
04-463 12 TOOTH 3/4" BORE #35 REBUILD 14.99
04-464 10 TOOTH 3/4" BORE #41 REBUILD 14.99
For Max Torque Brand Clutches Only
If you have a Max Torque Brand Clutch,
the Max Torque name will be stamped on the back of the clutch.

Chain Guard

Chrome Plated Chain Deflector

Part Number Description Price Add to Shopping Cart
1810 CHROME PLATED CHAIN GUARD 7.99
This chain deflector is universally adaptable to all small engines
Helps prevent broken chain from flying, diverting it to the ground
Universal Chain Guard, 2" wide, 7" long

Gem Chain Guard

Steel Chain Guard For Go Karts & Mini Bikes
Use on Briggs & Stratton and Tecumseh Engines

Part Number Description Price Add to Shopping Cart
GPG1228 CHAIN GUARD BRIGGS/TECUMSEH 18.99
Steel chain guard - 15" long

Briggs Chain Guard

Steel Chain Guard For Go Karts & Mini Bikes
Use on Briggs & Stratton and Tecumseh Engines

Part Number Description Price Add to Shopping Cart
GPG1227 CHAIN GUARD BRIGGS/TECUMSEH 16.99
Stamped steel chain guard 2-1/4" wide, 9" long

Small Chain Guard

Steel Chain Guard For Go Karts & Mini Bikes
Use on Briggs & Stratton and Tecumseh Engines

Part Number Description Price Add to Shopping Cart
1809 CHAINGUARD BRIGGS & TECUMSEH 8.99
Steel chain guard 1-3/4" wide, 7" long.
Mounting holes 4-3/4" apart center to center

Lock Collars

Locking Collars

Part Number Description Price Add to Shopping Cart
04-467 5/8" LOCK COLLAR 1/2" HEIGHT 1.99
04-468 3/4" LOCK COLLAR 9/16" HEIGHT 1.99
04-9263 7/8" LOCK COLLAR 9/16" HEIGHT 2.50
04-7329 1" LOCK COLLAR 5/8" HEIGHT 2.50
04-9265 1-1/4" LOCK COLLAR 11/16" HEIG 2.99

Split Lock Collars

Heavy Duty Split Locking Collars

Part Number Description Price Add to Shopping Cart
04-9266 SPLIT LOCK COLLAR 3/4" 5.50
04-9267 SPLIT LOCK COLLAR 1" 6.50

PARTS CATALOG INDEX

Accessories
Axles
Bearings
Band Brakes
Disc Brakes
Cables
Cargo Nets
Centrifugal Clutches

Chain & Links
Chain Lube
Engine Parts
Gaskets, B&S
Jackshafts
Kill Switches
Manco Parts
Max Torque Belts

Mini Bike Parts
Mini Chopper Parts
Pedals (foot)
Rims and Hubs
Safety Flags
Safety Padding
Shock Absorbers
Spacers/Bushings

Spark Plugs
Sprockets
Steering Wheels
Throttle Parts
Tie Rod Ends
Tires & Tubes
Tools Page
Trouble Shooting

Gear Ratio Chart
Go Kart Catalog
Mail In Order Form
Mini Bike Page
Ordering Information
Return Policy
Service Tips
Site Map

Comet Torque Converters: Comet Drive Belts, Clutches & Parts . Home . Parts Catalog

gokartsupply.com

Page Last Updated: 03/18/2010
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