depends on what the bore gauge says. however my guess bore and hone.
how does the bores look where the port are?
the piston is missing parts above the compression ring.
check the neutral safety switch. if the EDM thinks the motor is in neutral, the RPM wont go above a certain RPM
check fuel pressure. if you are TBI or MPI, there are different pressures.
Wiring diagram never existed.
Look for the generic information in the electrical forum. The wiring colors are an ABYC standard. And the wiring specific to the motor in the motor manual