1990 Yamaha g2 runs, then just quits and won’t start for about 15 mins

1990 Yamaha g2 runs, then just quits and won’t start for about 15 mins

Yamaha 1990 golf cart g2 runs for awhile, then dies. Wait 15 mins then usually starts. Replaced battery, coil, and solenoid. Ideas ? Some one thought ignition modular ? Please help.