A friend has a couple of tractors says they are either 8 or 9ns not sure if it matters too much, Im not sure how to identify them. Neither run but Im only working on one at a time. I do know they have run in the past and dont believe anyone has messed with them since. The one I am currently looking at has a side mounted distributor and negative ground. I replace the battery because it was not holding charge. Im not sure if the fuel system works, I cleaned the sediment bowl but upon failure to start I began using starter fluid to test for spark. Finding none, I concentrated on that. Using a multimeter I tested for ground and power the block is grounded and i have power to the coil. there are two terminals at the coil in excess of the plug wire which goes to the distributor cap. the first is the input and the second has a wire that disappears into the distributor housing i have 6.23 volts from either terminal to the block and at a connector half way to the distributor from the coil. I removed a spark plug which was rusty but looked almost new on the inside. and using the same bare metal spot on the block began to check for spark and found none. I removed the cap and tested for continuity accross the individual plug wires using the inside of the cap. all wires were continous. I took the cap off the dstributor hoping to see the inside but it only gives access to the rotor, theres a plastic cap under the rotor and im not sure how to remove it to look in there. Im hoping the coil is the issue as it would be an easy fix but I want to test and confirm before buying a bunch of parts. If it were mine I would do a full tune up with the coil but I was just asked to get it running and i dont believe in throwing parts at the problem or making those types of decisions for other people. Any how how did i miss anything obvious? and does any one have an idea how to test the coil and distributor assembly.