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How To Identify Comet Torque Converters

For 3hp to 18hp American Style Go Karts and Mini Bikes

Comet Belt Styles

Identify Your Series Using The Belt

Number On Belt

Belt Part Number

Comet Series

Belt Top Width

883 -


Obsolete TC88

5/8" Symmetrical

993 -


Obsolete CAT99

5/8" Asymmetrical

884 -


20 Series

3/4" Symmetrical

994 -


30 Series

3/4" Asymmetrical

40 -


40/44 Series

7/8" Symmetrical

The letters A & C, printed after the belt part numbers, are NOT relevant.

Identify the belt number stamped on the top width if legible.

Identify The Shape, a "V" shaped belt indicates the unit is a TC88, 20, 40 or 44 Series - SYMMETRICAL Type.

If the angles of each side of the belt are different, almost flat on one side - 2 1/2 degrees and angled 18 degrees on the other side you have a 30 Series or an older CAT99 Series - ASYMMETRICAL Type.

CAT99 and TC88 Systems that use a 5/8" top width belt are obsolete and no longer supported but the 5/8" top width belts are still available. Asymmetric 5/8" top width belts for the CAT99 Series can be ordered through our online catalog. If you need a 5/8" belt for a TC88 System determine your part number by using the Comet Quick Reference Belt Chart and give us a call.

A damaged belt is a symptom of another problem. Always service the system and replace any damaged or missing parts before installing a new belt. The components must be clean and perfectly aligned to work properly. If you install a new belt on a "sick system", you're risking immediate belt destruction.

Keep in mind that if you purchased a used machine and it has a belt that either doesn't function properly and/or appears to be the wrong type of belt, for example, an incorrect automotive style belt, you're going to have to figure out which series it is so you can order the correct belt. Determine the exact series, measure the outer diameter of the driven pulley and measure the center distance. That's the only way to determine the correct belt. Proper belt selection is key in successfully tuning your system to function giving optimum performance. Should your machine's center distance between the crankshaft and the jackshaft fall between the center distance (C.D.) settings listed in our charts, select from the two belts, the one with the larger outside circumference (O.C.) for best wear and to avoid machine "creep" during idling.

Identify Your Series With Pictures

Systems Can Be Symmetric or Asymmetric

Comet 30 Series Asymmetric Torque Converter

Comet 20 & 30 Series Driven Pulleys both have a #20 Stamp.
This Stamp does not determine the series type ... ignore it completely.

Asymmetric Systems have all the working parts on the same side.
Both Systems look alike except for the direction the Driven is mounted.

Example of An Asymmetric Set Up

30 Series Driven

Example Of A Symmetric Set Up

Comet Torque Converter

Rear View Of Driven Units

TC Systems

The Comet 30 Series & Obsolete CAT 99 Series are Asymmetric Systems.

The Comet 20 Series and the Obsolete TC88 Series are Symmetric Systems.

Modern 20 & 30 Series use a 3/4" Belt, the obsolete TC88 & CAT99 use a 5/8" Belt.

Systems For 8 to 18 Horsepower Engines

Symmetric 40 Series System

Comet 40 Series Torque Converter

Symmetric 44 Series System

Comet 44 Series Torque Converter

The Comet 40 and 44 Series Systems both use 7/8" Top Width Belts

Driven Cam Buttons & Spring Color

Comet Insert Button
Driven with 3 Buttons ...
The Button looks like this

Comet Insert Buttons
Driven with 6 Buttons ...
The Button looks like this

Symmetrical Systems

Symmetrical Series

Manufacture Dates & Spring Colors

Number of Cam Buttons


Pre 1986 Black Spring

3 Cam Buttons

20 Series

1986-92 Black Spring

3 Cam Buttons

20 Series

Blue Tension Spring

6 Cam Buttons

40/44 Series

Red Tension Spring

3 Cam Buttons

Asymmetrical Systems

Asymmetrical Series

Manufacture Date & Spring Color

Number Of Cam Buttons


Pre 1986 Red Spring

3 Cam Buttons

30 Series

1986-92 Red Spring

3 Cam Buttons

30 Series

Green Tension Spring

6 Cam Buttons

Driven Pulley Model Information


Identify The Driver Pulley

Measure The Post On The Fixed Face

Comet Torque Converter ID

Continue through the site to learn more about Comet Torque Converters. If you've already done the research and still need help ordering the right parts, call us for Free Tech Support Monday through Friday at 318-925-2224. Please have your details ready before you call. Technical Support is in high demand, if all our lines are busy, you'll get voice mail, wait awhile and call us back.

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