I have a zzr 1100 - 1992. All usual cheks are done, valves, carbs,pluggs etc. The problem is when I am trying to start a warm engine, which fails every time. I have to wait at least two hours before starting the engine again. The engine drives in all other aspects normally and starts easily when cold. Battery is new and charging is normal. The startor is ok. Compression test gave good results in cold and warm conditions. I might think that this would be an electric matter. Where should I look?