I did about 19,000 km on mine Blue and think youre about on the same km? If you are you may need to replace the rear pulley assembly? On mine the disc that moves in and out had come loose last year and once i took of my belt i could move the whole disc without the torque drive bit moving, it had come right off the torque drive. Maybe check that on yours? Mine still ran but when i pulled away it would stick in high gear for a few hundred yards then be ok but my speed was way down, i couldnt get over 30mph. Once i stripped it i saw it but it looked ok when it was still in cos the belt kept it in place.