My o4 will not accellerate while under load, it just bogs down real bad. While in neutral it will rev up no problem, but as soon as the transmision is engaged it just bogs. I tried new jets from 160 to 180 but no improvement. Tried playing with air/fuel mixture screw, no improvement. Top end was just rebuilt and all valves are perfectly in spec. My lights don't work and battery doesn't charge but this isn't new and my bike worked fine before with these problems. What could it be????? Something electrical???