Transmission Gears (Automatic with Reverse), 100cc ATVs & Dirtbikes

Automatic transmissions with reverse on 100cc ATVs and dirt bikes rely on a matched set of internal gears to deliver smooth acceleration and dependable shifting. Over time, these gears can wear down from heavy riding or misalignment, leading to noise, slipping, or issues engaging reverse. This collection includes replacement automatic-reverse gear sets made to restore proper operation on Honda-type 100cc engines.