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Garden Tractors Discussion Forum

kohler Engine Won't Fire

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Vernon Holt

12-11-2003 07:13:15




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My portable welder has been in dry storage for at least 5 years without being used. In attempting to crank it I find that there is no fire to the plug. The engine is a Kohler, K241P (16 HP I think).

I replaced the plug, points, and condensor and still no fire.

I am trying to avoid taking it to a local small engine repair shop for two reasons: 1. Cost is always a factor, 2. Extended delay in getting it back.

Any suggestions out there as to what to do next to correct the problem. Will Rust forming on the flywheel prevent the magneto from firing?

Any help will be appreciated. The engine is not electric start.

Vernon Holt

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terry

12-13-2003 15:11:29




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 Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 07:13:15  
the flywheel should be shined



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Bob

12-13-2003 18:04:56




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 Re: Re: kohler Engine Won't Fire in reply to terry, 12-13-2003 15:11:29  
These Kohlers use internal magnets, INSIDE the flywheel, which are ceramic, and don't rust. If there is any rust, it will be on the stator, or pole piece fastened to the bearing plate of the engine. The stator MAY get rusty, but not the flywheel part. Technically, I don't believe a little rust will affect the spark, unless the buildup is enough it actually bridges the airgap between the stator and the rotating magents.

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Vernon Holt

12-11-2003 19:56:53




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 Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 07:13:15  
My thanks to a great group of guys!! You have given me enough info to keep me busy for a day or two. I am down to removing the flywheel. I only have one size in a wheel puller, hope that it works.

Thanks again, Vernon Holt



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Vin A

12-12-2003 06:10:17




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 Re: Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 19:56:53  
Yes rust on the flywheel will sometimes prevent spark. Try to clean the area with some sand paper. And let me know how it is.



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Britt Misker

12-11-2003 16:58:13




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 Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 07:13:15  
Vernon,
Quite often an engine that has been in storage for a long time gets moisture into the coil and high tension spark plug lead insulation. This moisture will short out the affected parts and be a cause of no spark. A quick and dirty way to see if this is the problem is to spray the coil and high tension spark plug lead with WD-40. The wait about a half an hour before you try to crank the engine. Do not get the WD-40 on the points. The WD-40 drives the moisture out of the wire's insulation and removes the current's path to ground. This will only work if moisture is the problem. I would suggest that you replace the spark plug lead even if this WD-40 trick works. If the wire is the culprit, this will only be a temporary fix. It will short out again after the WD-40 dries out completely.
Don't use anything but WD-40. WD-40 was designed to drive moisture out of electronic equipment (amoung other things), and it does this quite well. I have used it on the inside of distributor caps also, but again, if it helps, I would change the cap as soon as possible.
Let me know if this helps. It may save you a trip to the small engine shop.

Good Luck,

Britt

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Bob

12-11-2003 08:05:10




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 Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 07:13:15  
First off, K-241 is 10 HP.

A little rust on the flywheel should not be a problem. If there is rust to the point that there is enough rust between the magnets and the pole piece of the coil so there is actual physical contact, that would affect spark. At any rate, lightly sanding off the rust sure can't hurt.

Is there a key switch or kill switch on the machine that could be shorted out, killing the spark? If you have such a switch, disconnect the wire to it at the engine. (Be prepared to stop the engine by alternate means, such as yanking off the spark plug wire, if necessary.)

Did you set the point gap correctly, with a CLEAN oil-free feeler gauge?

Are the connecting wires attached to the points and condensor in such a way that nothing is shorted to ground?

Have meeces eaten the wire from the points to the coil, or the high tension wire?

You can verify that your points are good by disconnecting the coil/condensor wire, and checking the points with and ohmmeter between the insulated point terminal and ground.

If the points check out, and you are not lucky enough to have 2 bad condensors, the coil is most likely shot.

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Vernon Holt

12-11-2003 08:46:02




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 Re: Re: kohler Engine Won't Fire in reply to Bob, 12-11-2003 08:05:10  
Bob: Many thanks for your prompt reply. I will make these checks.

I hate to ask this question, for it reveals my lack of knowledge, but this engine seems not to carry a coil. In this case, does the coil and condenser serve the same purpose??

Thanks, Vernon



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Gary in TX

12-12-2003 13:48:15




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 Re: Re: Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 08:46:02  
Hey Vernon,
I've worked on a bunch of Briggs engine but never messed much with kolers. Was it running ok when stored? Did it stay dry in storage?
You could have a wire chewed into my mice, could be mice have chewed on the magneto(coil) as well. Pull your flywheel clean the magnets on the flywheel and also the contacts on the magneto. I like too use a wire brush on a bench grinder to clean them but sand paper or emory cloth will work well too, be sure to clean afterwards the dust made while sanding. I'm not sure about the settings on the magneto in relation to the magnets on the flywheel. Does it have a low oil shut down switch on it? Have you checked the oil in that case?

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Bob

12-11-2003 16:59:09




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 Re: Re: Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 08:46:02  
The coil is underneath the flywheel, next to the block. (Unless it is a battery ignition, in which case you would see the round-can external coil.)

Follow your sparkplug wire backwards from the sparkplug, and it will lead you to the coil. You can download a factory service manual for free (pdf format) at...

http://www.kohlerengines.com/service_manuals.html



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Ben in KY

12-11-2003 09:25:44




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 Re: Re: Re: kohler Engine Won't Fire in reply to Vernon Holt, 12-11-2003 08:46:02  
I think your engine might be magneto equipped. If it has a coil beside the flywheel then it is magneto driven and that mag coil would be the coil bob referred to. Some of these engines had magneto coils and some had external coils. Not sure if magneto is the right term here, but I think you get the right idea.



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