Reply To: IMI Gearing for Rotax JrHome › Forums › General Discussion › IMI Gearing for Rotax Jr › Reply To: IMI Gearing for Rotax Jr August 27, 2004 at 1:49 am #47991 SuperslowParticipantA rotax junior should be about four or five teeth less than a senior, so start on a 13/75 or so…..
