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Hi everyone, I have an old MTD Yardmachines model 1J174K8081 and it has a 124802-0610-01 Briggs and Stratton engine. I recently had a spark plug lose conductivity so I replaced the plug and the same thing happened. I tested the ignition coil on 20k resistance setting and I was getting around a 6 reading on one side of the coil and the kill switch, the other side of the coil jumped around then showed it open so im guessing its bad. I need to order a new ignition coil but I cant find my model number. I took a few pictures of it removed to see if anyone can help Identify what I need. Thanks for any help.
Edit I tried to add the pictures but it says the pictures are too large.

I was able to reduce the size, its not as clear though to see the detail. There is a 9419P stamped on the plastic cover part plus a tiny B&S logo on one side with the number 9.

Thanks Startech, Do I also need a Magnet for the round spinning part?

A

Rich72 said:

Thanks Startech, Do I also need a Magnet for the round spinning part?

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As long as the flywheel magnet had a good magnetic pull, it's fine

Thanks for the Help, Ordered a new one today.

Before ordering parts, remove the old coil.

Clean and polish the mounting areas and the coil where it mounts. Gap the coil at 0.010" and snug the screws. Test for spark with a PET-4000 or a cheap Christmas light inline tester.

Lot of dirt on that coil. How are your cooling fins?

Cooling fins look ok, but the magnets could be worn also. I already ordered the coil so ill let you guys know if the problem is fixed after I get it.

Rich72 said:

Cooling fins look ok,

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Either they are clean like a new engine clean or they are not.

Got the coil in the mail today and installed it. It works again, thanks for the help all.

Question, is your spark plug looking real dirty when this happens? If so you could have an internal head gasket leak which would foul the plug as well

No the spark plug is brand new, he original problem was my spark plug didnt have any continuity when I tested it with an ohm meter, so I replaced it with a new one, I also tested the coil while it was on the motor after disconnecting the kill switch. The numbers seem to bounce around alot on one side of the coil but I figured maybe it was a little dirty. The same thing happened again where the spark plug looked brand new on the outside but inside there was a disconnect. Thats when I pulled the coil and tested it more thoroughly. So I replaced both the spark plug for a second time and also replaced the coil. It seems to run fine now.

Why oh why are you frigging around with your confusion meter ?
If you really want to test the coil then you will need an oscilloscope and a flux generator at the minimum because there is a Hall Effect timing chip of some sort on the primary windings
Secondly coils are no longer repairable so they are a works - don't work situation