- Either original equipment in the Comet drive clutches or a popular replacement for trail riding or racing
- 102-C, 108-C and 108-EXP clutches all use the same basic cam arm
- 108 4-PRO clutches use FOUR cam arms. (To find the required cam arm weight, add the weight of three cam arms used in a 108-EXP or other three-post clutch, add 14%, then divide by FOUR. This will give you the required new cam arm weight.)
- When ordering cam arms for a 108 4-PRO clutch, you must order FOUR cam arms to get the correct weight
- Comet arm weight objective is within .75 grams of that listed. Certified weights would be significantly more expensive. The variance may occasionally exceed 2 grams and is a result of greater or lesser arm density.
Fixed Weight: 46.4 g
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1978 | Polaris | Colt 250 | |
| 1976 | Polaris | Colt SS 250 | |
| 1979 | Polaris | Gemini 250 | |
| 1976 | Yamaha | SRX340 | |
| 1977-1981 | Yamaha | SRX440 | |