Mine was always problematic to start. A new battery improved things, but not 100%.
A month and a half ago, it started running on one cyclinder, I diagnosed it as a bad ECU (no spark to the H cyclinder).
Ordered a U59 ECU, received it Wednesday. Now the bike starts immediately as I hit the start button, every time, hot or cold, even afters sitting for 6 weeks!
Not a cheap solution, but recommended. Plus, I don't have the brick wall rev limiter at 8500 RPM anymore! (9600 now)
1986 LeMans w/ sidecar
2003 999R #29