Dear Sir: R&d May Co. 152 W Mill Street Bloomfield In. has engine service manual that tells how to test you ignition plus tool to hold crank shaft from turninng. Be sure to take the black lead wire loose from kill switch, Under the handle that raises the motor. The switch mounting rubber gets bad and shorts out the ig. Ps I need a throttle twist handle and switch for a 78 AMF Roadmaster can you help?