In Reply to: 48 8n no spark posted by mike on October 24, 2017 at 07:50:37:
Bruces' post is as comprehensive as any I have read in a long time. Below is a kinda qwik chek before you dive in deep.
Front mount or side mount?
First check which is sometimes overlooked. Current to the primary side of the coil. Switches fail, wires break, resistors fail. No current? Bridge the resistor or hot wire the primary side from the battery. You won't hurt anything bypassing the resistor one time.
If you have current to the primary side of the coil it might be as simple as opening the points and cleaning them off. Sometimes for some inexplicable reason after a long lay up they get an insulating coating on them particularly in humid climates. Check the tang on the rotor. Make sure it contacts the center post of the cap. Simple stuff first.
Or..........Key on, current to primary side, high tension lead from coil off the distributor and close to ground, use a small screwdriver to open and close the points. Be careful not to bridge the points or touch the housing with the screwdriver. Should get a hot spark to ground from the coil high tension lead. Or simply roll the engine over with the starter. No spark, points and precautionary condenser a possibility. Check the resistance of the coil or try a known to be good coil. Coils are pretty tough and long lived unless they have been overheated many times. On a front mount it's easier if you remove the distributor, ground it to the tractor, etc. and......front mount coils are said to be less reliable. I dunno.
Re read Bruces' post it has a ton of useful information. I did.