tom reed

May be some of you guys can help me, I've got a 1990 honda four trax 2 wheel drive, the top end has been completely rebuilt. When I bought it barely ran, so I had everything redone BUT, it shifts good until the motor gets up to running temp and it starts getting hard to shift and the longer you run it the worse it gets, it will get so bad that it is almost impossible to get it into reverse. Does anyone know what wrong?

I am rebuilding a 1990 honda four trax they were so reliable but here in Alabama its very hot in the summer time, being a air cooled engine I have considered adding a cooling fan for the engine and I have plenty of room for it but my question is will that overload the generator and battery on it. Maybe someone out there can answer that