My engine mounting bolts were worn causing my engine to move back and forth... put new bolts in so there was no play and it has held since... also make sure the holes on the frame are not ovaled out either... could cause the same thing... good luck! also I bought a oem Yamaha boot...
it looks normal to me. Im pretty sure i commented on this when you had on yfm350!
Im having the same problem, ripped two already. Have you figured it out??
My engine mounting bolts were worn causing my engine to move back and forth... put new bolts in so there was no play and it has held since... also make sure the holes on the frame are not ovaled out either... could cause the same thing... good luck! also I bought a oem Yamaha boot...
Thanks for the info! Ima look into that.