Spark, fire, coil test

[carym2a]

OK, I giveup, well not really I need help, I've been rebuilding a 394XP and seem to have no fire, so what I need to know is how to ck the coil with a multimeter, I'm coming up with Continuity between the coil and any part of the saw, this even with the kill switch disconnected. I'm thinking bad coil, I'm I on the right path? thanks

 

[lefturnfreek]

Well sorta depends on how much continuity. The power lead should have some small resistance to it, 200 - 1000 ohm as a guess off the top of my head, and the spark plug lead should be way higher, 10,000 - 50,000 ohms, again a guess. But if the power lead is a low ohm say round 1 - 3 ohm it's shorted out and same with the spark plug lead.

 

[joebob2020]

For a quick check, I stick a screwdriver in the plug wire and give turn the saw over. If I feel a tingle but can still not see a spark when the plug is grounded to case I check to make sure the coil has a good ground. Primary side of coil should have around 200v and secondary in the Kvolts. if you dont get a good spark at plug gap of .20 then coil is probably shot. This is the problem I have with my Stihl 028 and am looking for a cheap coil. Once you get spark you shouldn,t do the shock test.

 

[carym2a]

Found its just burned up failed all tests, replaced it and now she runs, and on to kit the carb.