All cam arms sold here are 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 All cam arms sold each NOTE: All cam arms are sold EACH. You must order FOUR of these arms to get the correct cam arm weight for a 4-PRO clutch and THREE for the 102-C and 108-EXP clutches. NOTE: 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.
