Classic Centrifugal Clutches For 3/4" or 5/8" Bore Crankshafts Part Number Description Brand Price Add to Shopping Cart 209760A CLUTCH 3/4"B 12TOOTH #35 CHAIN COMET 29.50 209748A CLUTCH 5/8"B 11TOOTH #35 CHAIN COMET 32.50 209768A CLUTCH 3/4"B 10TOOTH 40/41/420 COMET 29.50 04-458 CLUTCH 5/8"B 10TOOTH 40/41/420 MAX TORQUE 32.50 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. Max Torque Brand "TT" Track Tuneable Clutches Part Number Description Brand Price Add to Shopping Cart 04-453 CLUTCH 3/4"B 12TOOTH #35CHAIN MAX TORQUE 45.00 04-454 CLUTCH 3/4"B 13TOOTH #35CHAIN MAX TORQUE 45.00 Max Torque Clutches for 4 cycle Racing Karts. An excellent oval track clutch that can perform under severe operating conditions: water, dirt, dust, and oil. The major difference in this clutch versus the regular "SS" style clutch is the adjustability of the shoes and a stronger engagement spring. The drive plate is slotted to accept a special configured shoe that relies on the slots to drive the shoes. By varying the number of shoes installed, the engagement force at a given rpm can be changed, i.e.: removing a shoe will increase the engagement rpm. When altering shoe configurations in the "TT" clutch, it is important to remember that the shoes must be evenly spaced to proportionately distribute and balance the clutch in order to avoid excess vibration. Equipped with a built in 3/16" key. Available for 3/4" crankshafts and #35 chain only.

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 Hilliard's new patent pending 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 (end of crank threaded). Use a washer and bolt to secure the clutch onto the shaft.

Max Lube Clutch System for 3/4" Crankshafts

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 45.00 04-7681 CLUTCH MAX LUBE 10 TOOTH #40,41,420 45.00 Developed in conjunction with Chuck Brister, a major kart manufacturer in Louisana, 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 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 for Max Lube Clutch Part Number Description Price Add to Shopping Cart 04-8489 GREASE ZERK BOLT ASSEMBLY 7.95 Grease Zerk Bolt Assembly Fits Our Max Lube Clutch Part #04-7680 and 04-7681.

1" Bore Centrifugal Clutches

Comet SCS 400 Series 1" Bore Centrifugal Clutches w/Heavy Duty Needle Bearing Part Number Description Price Add to Shopping Cart 206169A CLUTCH 1"B 12 TOOTH #35 CHAIN 69.50 206170A CLUTCH 1"B 10TOOTH #40/41/420C 69.50 For Engines Up To 8 Horsepower These 1" bore clutches do not use set screws and mount onto the engine crankshaft with a lockwasher, flat washer and a bolt in the end of the crankshaft. Requires a crankshaft with a tapped end. The Part #206169A clutch for #35 chain has 12 teeth. The Part #206170A clutch for #40, #41 & #420 chain has 10 teeth. Designed and built for direct drive mini bikes and go karts, one of the most rugged applications ever required of a modestly priced automatic centrifugal clutch. Operates under conditions that would destroy most clutches.

Centrifugal Clutch Selection

Determine the clutch bore size by measuring the engine crankshaft. The bore is the hole in the middle of the clutch that fits over the crankshaft. You must also determine your chain type. A Chain Size Chart is located below. Make note of these determining factors before placing an order. If you are replacing an existing clutch, simply count the number of teeth and confirm the bore size.

Standard Roller Chain Specifications & Strengths
Chain Size	Pitch	Roller Diameter	Roller Width	Pin Diameter	Average Tensile	Pounds Per Foot
#35	3/8"	3/16"	3/16"	1/8"	2,100	.22
#41	1/2"	5/16"	1/4"	1/8"	2,000	.27
#420	1/2"	5/16"	1/4"	5/32"	3,700	.38
#40	1/2"	5/16"	5/16"	5/32"	3,700	.41

Centrifugal clutches do not engage at low engine idling speeds, but will engage as the engine RPM is increased with the throttle. The clutch bearing (bronze bushing) requires periodic lubrication. It's important when riding to prevent clutch slippage which generates excessive heat that can ruin the clutch bearing in two to three hours of operation. Slipping can occur while riding at slow speeds with high engine RPM.

Oil the bronze bushing (squirt oil directly on/behind the snapring) with a few drops of 30-weight motor oil before each use. Once your clutch has warmed up it's a good idea to oil the clutch again because the oil penetrates better when the clutch is hot. Never oil the clutch shoes or excessive slippage will result. Regularly check for loosened mounting bolts. Do not ride with an overtightened chain. This will wear out the center bushing of the clutch. Do not ride with your foot on the brake pedal. Never reuse a bent or distorted snap ring. If your go kart takes off by itself, that is an indication that it is badly in need of lubrication. If the go kart or mini-bike continues to take off by itself even after the clutch has been oiled then the clutch is burned up and must be replaced.

Go Karts with rear tires taller than 15" require a Torque Converter Drive System.

Centrifugal Clutches may be used if your rims are 6" or smaller.

Visit the Service Tips Page
To Learn More About Centrifugal Clutches

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Centrifugal Pulley Clutches

Max-Torque Belt Drive Centrifugal Clutches
Part Number	Description	Price	Add to Shopping Cart
04-864	PULLEY CLUTCH 3/4 BORE	52.50
04-865	PULLEY CLUTCH 5/8 BORE	52.50
Used with A or B section belts, 3/16" key included

Comet SCP 350 Series Belt Drive Centrifugal Clutches Part Number Description Price Add to Shopping Cart 202313A PULLEY CLUTCH 7/8" BORE S350 82.50 202312A PULLEY CLUTCH 1" BORE S350 74.50 3-1/2" Outer Diameter Clutch, Self Contained Single Pulley The 1" bore clutch has a 1/4" key, the 7/8" bore clutch has a 5/32" key

3/16" Clutch Keys Part Number Description Length Price Add to Shopping Cart 8454 KEY 3/16" X 3/4" 3/4" Long 1.00

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 Use in keyways on crankshafts, pulleys, hubs, etc. Cut as needed.

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

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 - 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.

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

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

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

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

Comet TAV2 30 Series Complete Kits Torque Converters For Engines Up To 8hp Part Number Description Jackshaft Sprocket Price Add to Shopping Cart 218353A TAV2 3/4" BORE #41/420 CHAIN 10 tooth 169.99 218352A TAV2 3/4" BORE #35 CHAIN 12 tooth 169.99 218355A TAV2 1" BORE #41/420 CHAIN 10 tooth 189.99 218354A TAV2 1" BORE #35 CHAIN 12 tooth 189.99 These kits have a super nice cast aluminum mounting plate with a built-in jackshaft . The cover completely encloses the system. Each kit comes complete with a belt and mounting hardware. They bolt to most Briggs and Stratton, Tecumseh and Kohler Horizontal shaft engines. The engine must have 4 threaded bolt holes around the crankshaft. A torque converter is nessessary if your wheels are taller than 15". See other torque converter components, information and replacement belts in our Comet Torque Converter Catalog. These Systems Use A 3/4" Top Width Comet Drive Belt #203589A.

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

Heavy Duty Split Locking Collars Part Number Description Price Add to Shopping Cart 04-9266 SPLIT LOCK COLLAR 3/4" 4.95 04-9267 SPLIT LOCK COLLAR 1" 4.95

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
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Page Last Updated: 04/20/2008

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