I'm not having the same issues on my RT900XT Motor got hot and had to replace the head and fuel injectors plus the water pump and some other bits. This had plenty of power before it has gotten hot and all the repairs. It has seemed to have less power and struggles and start giving me black...
I tried to start it will turn over and try to start it seems to fire up but dies instantly. Try after that and there seem to be no power to the starter. It's like there's something to keep the power off. Mess with Neutral safety switch but nothing. Played with the shifter and pedal but nothing...