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Small Air Cooled Gasoline Engines Briggs & Stratton, Clinton, Lauson, Maytag, Nelson, Wisconsin and other small air cooled engines. Sub forums for mowers, scooters and powered eqipment.

Small Air Cooled Gasoline Engines

Kohler 18 HP


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  #1  
Old 07-02-2019, 04:56:38 PM
AZ Gary AZ Gary is offline
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Default Kohler 18 HP

We are working on a Kohler Magnum 18 HP engine in a JD garden tractor. We have put in a new ignition module, disconnected all switches and wiring. Our understanding to get a spark nothing needs to be hooked up except the starter, and it should develop a spark. The gap is set a 14 as required by the manual the magnets on the flywheel are in good condition. Seems like it should spark but doesn't, any suggestions to help us out?
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Old 07-02-2019, 05:10:06 PM
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Tom Marshall Jr. Tom Marshall Jr. is offline
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Default Re: Kohler 18 HP

new coil
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Old 07-02-2019, 06:25:51 PM
AZ Gary AZ Gary is offline
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Default Re: Kohler 18 HP

The coil is part of the igniton module.
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Old 07-02-2019, 06:52:19 PM
Elevated Elevated is offline
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Default Re: Kohler 18 HP

Did you have a spark plug on both coil wires when you checked for spark? Some dual lead coils need a plug on both wires to make a spark.
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Old 07-02-2019, 07:41:43 PM
AZ Gary AZ Gary is offline
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Default Re: Kohler 18 HP

We did most of the time, but we did have the second off at the last. Will make sure we have both connected from now on.
thanks for the heads up.
Gary
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Old 07-02-2019, 09:13:10 PM
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Default Re: Kohler 18 HP

mine run on 1 cyl. , no spark on the other wire when you held it close to the metal part of eng. running, was 65.00 for a new one. runs now.

---------- Post added at 09:13:10 PM ---------- Previous post was at 09:06:06 PM ----------

you are right both plugs fire together and should with the switch wires off coil. if you put a plug on each wire and lay them on eng. and there is no spark bad unit
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Old 07-02-2019, 10:00:45 PM
AZ Gary AZ Gary is offline
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Default Re: Kohler 18 HP

Is there any way to check out a module with an ohm meter or any other way? We got the Best China made when we got the new ignition module.
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Old 07-03-2019, 06:50:11 AM
MrBrown MrBrown is offline
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Default Re: Kohler 18 HP

Aftermarket coils are known to be bad. One after another. One's that do work are known to not fire in colder weather.
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Old 07-03-2019, 10:28:17 PM
ArodaPowerCo ArodaPowerCo is offline
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Default Re: Kohler 18 HP

I have a good deal of experience with Magnum Twins. Used to maintain a small fleet of them on Scag three wheelers. OEM is the only way to fly on ignition modules for these. Hard as they are on the wallet, generally they hold up well unless they get overheated. Keep the mice and grass out of the shrouds and all will be well.
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Old 07-05-2019, 10:24:10 AM
Boris Boris is offline
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Default Re: Kohler 18 HP

Since it has a non impulse magneto, the engine has to spin fast enough to generate a spark.
A new, proper sized battery and thinner weight oil fixed mine.
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Old 07-05-2019, 10:51:51 AM
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Default Re: Kohler 18 HP

We run a few of the Kohler Command 25 s. the mice have been busy and love to get under the air shroud, trouble is, not only do they fill it up with nest, they also chew wires. The one would give trouble starting, but eventually would start, then get hot. Took the shroud off and cleaned the mess out, then found a bunch of bare wires to the coils, it would short out against the manifold. fixed that so now it seems ok.
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