I also posted this problem on the RS77 Forum. Here's the situation. I have a '77 R100RS that won't engage the starter when warm. The battery is brand new, and the charging system seems to be working fine. The bike starts very easily when cold, but if run for awhile, and then stopped and shut off, I get nothing when trying to restart. If I let the bike cool for 20 or 30 minutes, it will start right up again.
I've owned this bike for about 18 months, and ride it daily for commuting. I have no problem if I start it in the morning, ride to work, then start it up again at the end of the day to ride home. However, if I stop to get gas on the way to work, the bike won't start until it cools off. Of course, it will "bump" start just fine, but that's kind of a pain.
So it seems to be directly related to:
- starter solenoid
- starter relay
- diode board?
Any thoughts? Many thanks in advance!