JD 112 ignition

300 dave

Member
HI, I have a JD 112 that will not spark. I have put on a new coil, condenser and points. I have no spark at the points or plug. This was running fine when parked last fall. I am at a real lost state. If anybody has any ideas, I would love to hear them. Thanks in advance dave

ps the safety kills were all removed years ago;like the shift knob. I have power to the coil.
 
(quoted from post at 22:18:00 07/07/19) HI, I have a JD 112 that will not spark. I have put on a new coil, condenser and points. I have no spark at the points or plug. This was running fine when parked last fall. I am at a real lost state. If anybody has any ideas, I would love to hear them. Thanks in advance dave

ps the safety kills were all removed years ago;like the shift knob. I have power to the coil.
Any chance the new coil isn't any better than the old one? I had that happen a couple weeks ago.
 
(quoted from post at 00:37:26 07/08/19)
(quoted from post at 22:18:00 07/07/19) HI, I have a JD 112 that will not spark. I have put on a new coil, condenser and points. I have no spark at the points or plug. This was running fine when parked last fall. I am at a real lost state. If anybody has any ideas, I would love to hear them. Thanks in advance dave

ps the safety kills were all removed years ago;like the shift knob. I have power to the coil.
Any chance the new coil isn't any better than the old one? I had that happen a couple weeks ago.


possible, but I tried 3 others first before buying a new one
 
Check that +12v supply is connected to + terminal on coil and that condenser is connected to - terminal on coil,if either connection wrong/reversed you will not get spark,also check for circuit thru points with an ohmmeter when points closed,points may not be closeing all the way due to being set incorrectly or cam pusher pin broken/sticking.
 
I am assuming you have a battery ignition Kohler engine.
Specifications can be confusing.

You need to have +12 volts at the + terminal on the coil with the ignition turned on.
Check to make sure the wire from the - terminal on the coil to the points has continuity (0 ohms resistance).
The points should be set so there is a gap of .020 when open the widest.
The points should close once each engine revolution.
 
(quoted from post at 22:00:31 07/07/19) I am assuming you have a battery ignition Kohler engine.
Specifications can be confusing.

You need to have +12 volts at the + terminal on the coil with the ignition turned on.
Check to make sure the wire from the - terminal on the coil to the points has continuity (0 ohms resistance).
The points should be set so there is a gap of .020 when open the widest.
The points should close once each engine revolution.

"The points should close once each engine revolution."

Or, more correctly, the points will OPEN once every TWO engine revolutions!
 
Take the spark plug out of the head, Put it back in the sparkplug wire boot and lay it on the heat shield. Disconnect the wire to the
points and put a jumper wire on the coil (-). Turn the ignition on and verify 12v or close to 12v. at the coil, not with a test light, but
with a meter.
Touch the jumper wire to a bare metal place on the engine momentarily. When you pull it away, You should see a good spark jump the
contacts on the spark plug. If you see a spark at the spark plug, you have verified that the coil and spark plug wire are good. If you
don't see a spark, try a different spark plug, a different spark plug wire, or a different coil. Also make sure the coil is grounded to
the engine and not just laid on the engine or dangling from the wires. The case of the coil completes the high voltage circuit.

If you do see a spark, your problem is in the points, the points plunger, the cam itself (verify that the plunger is moving inward once
every 2 revolutions of the crank) OR the wire between the points and the coil. (I have seen two engines where the metal wire holders had
worn through the insulation and caused an intermittent no-spark issue.)
 

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