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This thread deals with lack of spark or ignition issues with the P216, P218 and P220 engines used in the late 80s and all 90s tractors originally equipped with the Onan. this would be your 3,4,500 series tractors that typically look like the one below with the Onan twin engine...... Parts of the manuals you will need to diagnose the issue........ testing of these components is also in the demystification guide as well..... typical engine wiring diagram..... Aside from any other issues, the coil and/or module are usually the culprits IF anything needs replacing. I say that IF, because not always are the ignition components faulty. it can be a simple wiring or terminal issue not letting 12 volts to the coil. if any components need replacing here is the part numbers you will need.... Coil Toro Part # 71-6000 Onan Part #166-0761(old part #) superseded by part #541-0522 kit (includes a mounting bracket and 166-0820 coil to mount in the oem location) if you wanted to buy new. If looking for used or nos use the 166-0761 or if you don't care about using the oem looking coil, a 3 ohm Harley coil can be substituted. Module. Toro Part #71-6380, NN10444 (old number) Onan Part #166-0785 (insulator if you need to replace it is 166-0786) rarely do the rotor and condenser need replacing, but if you are after their part numbers here they are...... Rotor Toro Part #71-6010 Onan Part #166-0767 Condenser Toro Part #59-1180 Onan Part #312-0256 â€‹Places these parts can be purchased (shop around the prices vary big time) http://www.onanparts.com Your Local Toro dealer Ebay (harley coil) check with Boomer a recent new member on the forum as well. I've heard his prices are good. http://www.wheelhorseforum.com/user/13637-boomers-influence/ I just threw this together fairly quickly, i would like a few of you guys out there to critique or comment on what i have here. maybe it need some additional input, maybe some stuff needs changing. i put this together in the hopes of helping some new to the world of Onan get one with ignition issues hopefully up and running.