Bike had 20,000 mile service last year. Recently replaced the battery. Went to ride it tonight and started fine. Then was riding less than a mile and heard a clunk. Then realized the starter had started to run again. Took It back to the house and tried it several more times. would fire right up without even touching the starter. just had to tuen the engine to "run" and turn the tank **** to the right. Anyone else experience this? Thank you for your help!