Home Forums 2-Cycle Racing KT-100 Gearing at Gopro Motorplex? Reply To: KT-100 Gearing at Gopro Motorplex?

Jay Sinon

My daughter runs Yamaha jr. at MMX and we run anywhere from a 10/75 when track track is bad to a 10/72 on a race day. it really depends on the rubber on the track and what  her rpm is that day I keep adjusting until the motor turns right around 14000 RPM’s her motor seems to run out over 14200. I think Jeremy is right a good number to start with is 10/73 or 11/80 – 11/81. obviously The more speed you can carry out of the turns the lower number gear you can run and the faster you will go, but if you bogg a KT100 down it takes a long time to get your rpm back.

TaG Sr.