With that many miles your clutches are likely shot. Its pretty easy to rebuild them just change everything so that means springs, buttons, bushings, plastic washers and maybe even the bolts in the primary holding the weights and rollers if they are worn. For sure the shim bolts in your secondary used for setting the belt height are worn down, get new ones. Lastly as was mentioned align the motor there's a tool for setting it up. My experience has been that the clutches need some love about every 2k. Check your weights and rollers for wear as well. If your clutches have been slipping which is likely the case check the sheaves on your secondary to make sure the belt hasn't grooved them, it happens, Ive seen belts eat right through the secondary.
M5
