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Asymmetric Torque Converters

Driver Clutches, Driven Pulleys, Parts and Info

Comet 30S Driver

Comet 30 Series Asymmetric Driver Clutch

Part Number

Description

Price

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219552A

DRIVER 3/4" BORE 30 SERIES

79.50


Uses an Asymmetric, 3/4" Top Width Belt that's flat on the engine side.
The Driver Clutch bolts firmly to the Engine Crankshaft and must not float.
3/4 bore has 3/16 key, 1" bore has 1/4 key. Engages at approx 2200rpm, 4-19/32" OD

Asymmetric Belts are flat on one side, angled on the other. Flat side to engine.
White Arrows and the words THIS SIDE TO ENGINE are printed on the top of the belt.

Comet 30S Drivens

Comet 30 Series Asymmetric Driven Pulleys

Part Number

Description

Diameter

Price

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219465A

DRIVEN 3/4" BORE 30S 6"

6"

89.50


219457A

DRIVEN 5/8" BORE 30S 7"

7"

89.50


219464A

DRIVEN 3/4" BORE 30S 7"

7"

89.50


Uses an Asymmetric, 3/4" Top Width Belt that's flat on the engine side.
The "Driven" Pulley Rides on a keyed jackshaft. Has a Green Tension Spring.
The 6" OD, 5/8" Bore Part #219456A is Not Available, Factory Backorder. No ETA at this time.


Popular Models Equipped with Asymmetric Torque Converters:


Manco Go Karts, Tecumseh or Robin Subaru Engine, Foot Pedals w/3 Holes
Fits Manco Model 285 and 286 Dingo and Fox Go Karts, 485, 486, 606, 806
Manco 6hp Big Cat Mini Bikes with Tecumseh Engines and Huge ATV Wheels
Masters of Motion Go Karts under 8hp with Tecumseh Engines, Fort Wayne
American Sportworks Go Karts, Replaces American Sportworks Driver #14716
Murray Go Karts with Tecumseh Engines, Murray Driver #680167,#1201404
Kartco and Road Boss Go Karts with Tecumseh Engines, Made in Mississippi
Avenger Yellow Jacket Go Karts with Tecumseh Engines, Made in Louisiana
Carter Brothers Go Karts with Asymmetric 30 Series and Tecumseh Engines
Hammerhead Mudhead, Driver Clutch #9.500.010/Driven Pulley #9.500.001
Hammerhead 80T, Driver Clutch #9.500.010 and Driven Pulley #9.500.001
Brister's ThunderKarts with Tecumseh Engines, Made in Louisiana in the 90's
200cc Trailmaster Mid XRX Go Karts, Klipper Karts, ProKart and Pathwinder
Ken-Bar Brand, Streaker Go Karts under 8 horsepower, Tecumseh Engines
Trailsport Buffalo Mini Bikes with bolt-on, Comet Torq-A-Verter Kits (TAV2)
BKS Go Kart Models: Groundhawg LX Go Kart and The Kangaroo LX Go Kart
Yerf-Dog Go Karts with Tecumseh Engines, Yerf-Dog Go Kart Model Number:
1400,3002,3200,3202,3203,3203A,3205,30021,30034A,32001,33002,33200

The Black and Silver Components on this page are compatible and can be mixed.
Asymmetric Drivers

Asymmetric Driver Clutches For 3 to 8hp

Part Number

Description

Price

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G3000

DRIVER 3/4" BORE ASYMMETRIC G3

69.50


G3100

DRIVER 1" BORE ASYMMETRIC G3

89.50


Uses an Asymmetric, 3/4" Top Width Belt that's flat on the engine side.
The Driver Clutch bolts firmly to the Engine Crankshaft and must not float.

Asymmetric Belts are flat on one side, angled on the other. Flat side to engine.
White Arrows and the words THIS SIDE TO ENGINE are printed on the top of the belt.

Asymmetric Driven

6" or 7" Asymmetric Driven Pulleys For 3 to 8hp

Part Number

Description

Diameter

Price

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G3200

DRIVEN 5/8" BORE 6" ASYMMETRIC

6"

69.50


G3300

DRIVEN 3/4" BORE 6" ASYMMETRIC

6"

69.50


G3500

DRIVEN 5/8" BORE 7" ASYMMETRIC

7"

79.50


G3600

DRIVEN 3/4" BORE 7" ASYMMETRIC

7"

79.50


Uses an Asymmetric, 3/4" Top Width Belt that's flat on the engine side.
The "Driven" Pulley Rides on a keyed jackshaft. Has a Green Tension Spring.



General Information



How does a torque converter work? The drive clutch is activated by centrifugal force from the engine crankshaft. The moveable sheave of the clutch is forced in as the RPM of the engine is increased. This contacts the drive belt. The drive belt will then be forced to a larger diameter within the clutch sheaves, thus pulling it to a smaller diameter within the driven unit sheaves. The moveable sheave of the driven unit is forced out, allowing the belt to seek it's smaller, high speed ratio diameter. As this happens, the speed from the engine transferred to the final drive is increased.

The asymmetric torque converter components use a 3/4" top width belt. The belt mass is desirable in applications requiring extra rugged driving ability, such as dune buggies, go karts, mini bikes, ATV's, grounds maintenance equipment, materials handling devices and industrial equipment. It's mounted with both stationary sheaves inboard requiring only minimum displacement. All the working parts are on one side.

The asymmetric type torque converter system has sheave faces that have different angles. It uses a belt that's flat on one side and angled on the other. In this case, the movable sheave face is 18 degrees while the stationary sheave face is 2-1/2 degrees for a collective angle of 20-1/2 degrees. By having both the driver clutch and driven pulley fixed sheave faces on the same side (inboard) the system can be mounted on a fixed plate, in the same plane. See the 30 Series TAV2 Complete Kits. This offers some very significant advantages to mounting requirements in many cases. Noting the displacement diagrams you will see that the torque sensing cam assembly is mounted outboard adding further to the convenience of many installations with displacement problems. The asymmetric concept, having the 18 degree angle on one side requires less sheave face travel to lift the belt to larger, comparable pitch diameters of the symmetrical system. This makes it possible to force the belt to a diameter within the drive clutch (at high RPM) that exceeds the usual 1:1 ratio of standard systems. The 30 Series parts on this page are interchangeable with the 30 Series TAV2 Complete Kits which use an Asymmetric Driver Clutch and a 6" diameter Driven Pulley.

The spring and flyweight assembly in the driver clutch actuates the movable sheave and responds to engine RPM and should be replaced if the pins or springs are even slightly loose. If they are not VERY tight the loose pins and springs will prevent the pulley from disengaging. If your machine tries to take off by itself you may need to replace this part. Other problems that could be causing the system to be engaged all the time: dirty components with a lack of lubrication, worn out splined hub, the drum not correctly installed or a weak spring in the driven pulley.

The 1" Bore Clutches do not use a Bronze Bushing.


Flyweight Assembly

Comet Spring and Flyweight Assembly for Driver

Part Number

Description

Price

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200344A

SPRING AND FLYWEIGHT ASSY

29.50


If this part goes bad, the clutch will stay engaged all the time.

G3 Bronze Bushing

Bronze Bushing for Driver Clutch

Part Number

Description

Price

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G30120

BRONZE BUSHING G3

9.50


The belt rides on this bushing, inside the driver clutch.
For 3/4" bore drivers only, the 1" bore does not use a bushing.

Driven Snap Ring

Special Snap Ring for Driven Pulley

Part Number

Description

Price

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G00120

RETAINING RING G2,G3 DRIVEN

5.50


Driven Spring

Green Spring for Driven Pulley

Part Number

Description

Price

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G30110

GREEN SPRING G3 ASYMMETRIC

18.50


This Spring Must Be Pre-Loaded ... Read the Installation Instructions!


Green Spring Installation Instructions


Adjusting the spring tension on the driven pulley changes the rpm range at which the unit shifts into high gear. The three numbered holes on the cam are used to change the spring tension. Hole #1 provides the least tension and allows the unit to shift gears at a lower rpm. This is good for flat ground. Hole #3 provides the most tension and allows the unit to shift gears at a higher rpm. This is good for hilly terrain. Hole #2 is the factory setting providing medium tension good for the most common riding conditions.

You must pre-load the spring when installing it into the driven pulley. After placing the end of the spring in the desired hole and aligning the flat spots in the center of the cam with the flats on the post, just before pushing the cam all the way on to the post, turn the movable sheave clockwise -- tightening the spring -- bringing the buttons past the points of the cam and into the next valley. While holding tension on the spring, push the cam all the way on to the post and secure it with the snap ring. When you release the movable sheave the spring should rotate it counter-clockwise until the plastic buttons press against the cam. The insert buttons must not "float" between the cams.

The "20" stamped on the cam indicates that it is a 20 degree cam, not that it is a Series 20 torque converter. The 20 degree cam is used on both the 20 and 30 Series torque converters. One way to tell the two apart is to look at the angle of the pulleys. On the 20 Series, both pulley sheaves have the same angle. On the 30 series, the sheave toward the motor is nearly flat while the opposite sheave is angled.

Insert Buttons

Set of 3 Black Comet Insert Buttons

Part Number

Description

Price

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204332A

BAG OF THREE INSERT BUTTONS

4.50


For Driven Pulleys that use Six Black Insert Buttons
GLUE INTO PLACE WITH CONTACT CEMENT OR SIMILAR PRODUCT


All the plastic insert buttons must be in place at all times. Don't run the system if any of the buttons are missing. Missing buttons will allow the driven pulley to open too far and the belt will go down into an area of the pulley where it's not supposed to go. If the belt comes in contact with the rivets it usually damages the belt. In addition, the buttons also keep the movable sheave from spinning, they reduce friction between the cam and the movable sheave and they prevent metal to metal contact, acting as shock absorbers so they play a very important role.


Torque Converter Maintenance


Maintenance will include proper cleaning and lubrication of the driver and driven. Inspect the torque converter on a regular basis for dirt, frayed belts and any other potential problem obvious from a visual inspection. Always service units before each season. Maximum service interval recommended is each 50 hours of operation.

Drive and driven pulleys should be parallel. Friction faces must be smooth and free of dirt, corrosion, oil or grease. Belt must be dry, straight, and free of cracks, breaks and uneven wear. Operating the vehicle in a dusty environment will require more frequent servicing.

Use Dry Film Lubricant in all models of Torque Converters.

Indicators of a torque converter system requiring cleaning and lubrication are erratic or jerky engagement upon acceleration and a tendency to apparently "lock" into a particular speed (a second cause of jerky engagement is an excessively loose drive chain). If either one of these conditions exist service the unit immediately. Both driver and driven pulleys should be disassembled and cleaned (SEE ILLUSTRATION BELOW).




C -- CLEAN ... L -- LUBRICATE


Visit the Trouble Shooting Page for more information on malfunctioning Torque Converters. Belts eventually wear over time but a damaged or torn up drive belt always indicates that a problem exists with the system. Only replace your drive belt after the problem has been corrected. Components must be clean, lubricated and perfectly aligned to function properly.


Early Model Manco 5-6hp T.C. Breakdown


If you own an early model Manco 5 or 6 horsepower go kart powered by an Asymmetric Torque Converter click here to view the assembly sequence of your drive system. This is the old style Manco Factory set up that used a thick plastic cover that snaps down over two arms that stick out. The torque converter cover style and cover hardware may vary on later models, but the mounting plate, jackshaft, bearings and components are all the same. If your Manco brand kart is equipped with a 12 tooth jackshaft sprocket, you have #35 chain. If your Manco brand kart has 9 tooth jackshaft sprocket, you have #420 chain.


How do Asymmetric Torque Converters Work?


As the engine R.P.M. increases, the Driver pulley flanges continue to close together. This action, in turn, is squeezing the belt out to a larger Driver unit diameter. This action is dependent on acceleration and lack of torque load on the Driven element, allowing its pulley flanges to open thus creating a smaller driven unit diameter. If the torque load is increased this ratio is reversed instantly and smoothly to its requirement. The ratios between low and high are infinite to meet all demands within its realm of capabilities.

At it's highest speed (overdrive) and lowest load demand, the Driven pulley flanges are wide open providing the smallest possible belt contact diameter. The Drive unit pulley flanges, at this point, are closed to provide the largest possible belt contact diameter. The unique asymmetric arrangement of the belt and pulley angles allow the belt to exceed diameters possible with the standard "V" pulleys, thus overdrive.

Factory Authorized Distributor