A good straight edge should be added to the list of tools.
Check the valve body as well as the case for straightness. Any minor discrepanies can be cleaned up with an oil stone. :D
Engine harness.
Unplug it and clean the connector. Better yet remove the two large wires and splice them together. This will save the connector from burning up.:D
32 to 3500 RPMs governed. If you want to save fuel. drive it slow. If you want power, what little there is. Drive it like you stole it. LOL
Any IDI I have driven has hit the govenor on a regular basis.:D