2072 ignition coil
 

Have an 2072 with a Kohler repower CH730-0097 engine in it. looks to be a 2004 year model. Had to replace the rear seal in it, so while out (and had to remove ignition coils anyway) I thought I would ohm the coils (reason being, after mowing for a while and shut it off, it backfires and wants to stay running, then finally shuts off) one coil reads 8.97k ohms to ground and the other reads nothing. I believe the one reading nothing, might be bad. Is there a correct way to ohm them or do you have to have connected back up and check it at the spark plug with a tester.

Thanks for any input

Randy

Page 42 in the Kohler CH manual gives you the readings to check for. I think you have figured out though.

:bigthink:

t would seem that if one of the coils is bad, it would run real rough.

well put engine back in and checked each plug and it had spark. so i guess all is well, runs good, except it still backfires when you back off of the throttle. Any one know why it still does this?

Usually an exhaust backfire on deceleration is because of an over-rich fuel mixture.

Other possibilities are:
-leak in the exhaust that lets air in
-vacuum leak
-exhaust valve not seating
-timing off (not likely on a magneto ignition, but possible)

More than likely, too rich on the carb.

In addition...your engine maybe running hotter than normal too.

When my 1872 was shutting down after mowing for about a 1/2 hour, it would start after leaving it for a couple hours. I knew the coil was bad and while replacing it, noticed the fins on the cylinder jugs were darn near plugged solid. I dug out the pressure washer and it blasted right through it all leaving wide-open passages. I'm sure the extra heat caused by the plugged fins is what caused the demise of the old coil. Once all back together, it no longer stopped after running for a 1/2 hr and no longer backfired on shutdown.

Thanks for the info; while I had engine out on table, I pulled housing and cleaned the blower fan and all areas really good, it had a bunch of build up on them, so I know its all clean inside.

How would one go about adjusting for too rich of fuel, would it have an adjustment screw on carb? Thought I would ask before I messed something up!!