8n with side mount distributor. It has an aftermarket starter button and on/off switch. I have been using this tractor for 7 years without issue. It is still 6 volt. Been fighting this since last fall. It quit running, determined there was no spark. Chasing it down testing everything, found the coil wire grommet to the distributor was broken. Fixed that, ran fine. Also replaced the copper strip and insulator, condenser, points (gapped to .025), cap, rotor, and plugs. Went to start it this spring, wouldn"t start, no spark. Tested evrything out, found nothing. Recharged battery, it started and ran for 10 minutes then died and wouldnt start again. Retraced my steps, made sure nothing (copper strip, etc.) was grounding out. Pulled a plug to check again for spark, turned engine over and it started. Shut off engine, reinstall plug, wont start. Pull plug again (what the heck, right??) and no start, no spark. Tested switch, it was fine but replaced it anyway, tested coil, it was fine but replaced it anyway. Replaced plug wires. Have rechecked all connections at least twice. Cleaned up plugs and points, tractor started and quit within 10 seconds. Cleaned plugs and points again, no start. SO, to sum it all up,...new points, plugs, condenser, cap, rotor, plug wires, coil, switch, copper strip and insulators. I am stumped. Any suggestions are appreciated.