i have a 1982 yamaha maxim 550 that ive been trying to restore. i have finally got it to run, however, when i ride it it does not last more than 10 minutes before sputtering and stalling out at the next stop sign i come to. if i let it sit for awhile it will fire right up and be ready for another 10 minute ride. im worried something is overheating, and more worried there is engine damage. any thoughts?