8n 1950 cut off

[ken benfield]

8n manufactured post 1950 12 volt conversion. use to start and run good.in garden and would not start after shutting down to change implement.backfired a little but would not crank.
getting 2.8-2.9 coil ohms.gas is flowing fine.i know water is leaking into oil but has ran fine since aquiring.could this be weak "sparkies" again?plan on overhaul after garden time(hope she can go a little more).please help

 

[Bruce (VA)]

So, it's a sidemount coil, right?

Does the engine turn over (crank) when you press the starter button? Are you saying it turns over but does not fire?

Do you have battery voltage across the points when they are open? Verify the gap on the points at .025. Then, run a new clean dollar bill through them. New points sometimes have a residue & old points can corrode, or get grease from the distributor cam on them. Or, you could have used a dirty feeler gauge. (I always spray mine off w/ contact cleaner.) Make sure you have voltage across the points, as in past the insulator on the side of the distributor. That is a very common failure point on sidemounts & often hard to find because it is usually an intermittent short. (If you find the short there, the Master Parts catalog lists everything you need on page 154. You can make the strip and you could also make the insulators as well. But, somethings are just easier & in the long run cheaper to buy. Get the strip, 12209, screw 350032-S, 12233 bushing & 12234 insulator & just replace it all.)
50 Tips

 

[ken benfield]

yes,side mount coil,sorry-i should remember all specs.

 

[ken benfield]

it turns over fne but will not fire up??

 

[Brent 41 9N]

My front mount 9N did exact same thing - found it to be tab on rotor button, broke right off???? don't kno why, but I replaced it and it run great again.