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Offline cadet1863

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ch18 problems
« on: September 20, 2009, 12:07:21 pm »
Starts and runs well for about a half hour, then backfires and eventually shuts off. Will not re-start for two days, then repeats the above. It has gone through the same cycle 4 times now.

I have checked the fuel delivery and gas is coming out the main jet into the carburetor, but the spark plugs are dry. Also, I am getting no spark.

Any ideas?

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Offline freakboy

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Re: ch18 problems
« Reply #1 on: September 20, 2009, 12:26:56 pm »
Did you try replacing the plugs?
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Kyle wilson
46 ci briggs opposed full pressure lubed under the hood.

Offline cadet1863

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Re: ch18 problems
« Reply #2 on: September 20, 2009, 07:00:59 pm »
Yes, I installed new plugs
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Offline freakboy

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Re: ch18 problems
« Reply #3 on: September 20, 2009, 07:02:55 pm »
compression is good? and it is getting fuel? i had a old 2 stroke atv that was like that it ran fine untill it stalls then you couldnt kick it over for anything but you could pop the clutch and get it started. i forget what the next owner did to get it running i would have to talk to his son tomorrow. try rebuilding the carb if you get good compression.
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Kyle wilson
46 ci briggs opposed full pressure lubed under the hood.

Offline cadet1863

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Re: ch18 problems
« Reply #4 on: September 20, 2009, 07:12:08 pm »
Thanks, I'll try
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Offline freakboy

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Re: ch18 problems
« Reply #5 on: September 20, 2009, 07:17:58 pm »
no problem glad to try and help, im not sure if anyone else here would have a better answer to this problem.
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Kyle wilson
46 ci briggs opposed full pressure lubed under the hood.

Offline jerb

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Re: ch18 problems
« Reply #6 on: September 20, 2009, 07:24:41 pm »
Quote from: cadet1863 on September 20, 2009, 12:07:21 pm
Starts and runs well for about a half hour, then backfires and eventually shuts off. Will not re-start for two days, then repeats the above. It has gone through the same cycle 4 times now.

I have checked the fuel delivery and gas is coming out the main jet into the carburetor, but the spark plugs are dry. Also, I am getting no spark.

Any ideas?


you say you have no spark!
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Tim Jerby
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Offline cadet1863

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Re: ch18 problems
« Reply #7 on: September 20, 2009, 07:55:13 pm »
Yes, no spark.
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Offline jerb

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Re: ch18 problems
« Reply #8 on: September 20, 2009, 07:56:47 pm »
so it would not be a carb problem,
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Tim Jerby
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Offline freakboy

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Re: ch18 problems
« Reply #9 on: September 20, 2009, 07:59:06 pm »
is the coil old?
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Kyle wilson
46 ci briggs opposed full pressure lubed under the hood.

Offline cadet1863

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Re: ch18 problems
« Reply #10 on: September 20, 2009, 08:27:13 pm »
This is a capacitive discharge (ignition module) system, no coil
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Offline freakboy

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Re: ch18 problems
« Reply #11 on: September 20, 2009, 08:27:53 pm »
im guessing that went bad on it.
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Kyle wilson
46 ci briggs opposed full pressure lubed under the hood.

Offline jerb

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Re: ch18 problems
« Reply #12 on: September 20, 2009, 08:34:23 pm »
no coil?? every ignition system i have ever seen uses a coil of some type!
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Tim Jerby
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Offline rotten ron

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Re: ch18 problems
« Reply #13 on: September 21, 2009, 10:36:03 pm »
At the end of the spark plug wires would be the coils,it might be the kill wire that is bare and grounding out
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Offline cadet1863

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Re: ch18 problems
« Reply #14 on: September 27, 2009, 12:55:20 pm »
Quote from: cadet1863 on September 20, 2009, 12:07:21 pm
Starts and runs well for about a half hour, then backfires and eventually shuts off. Will not re-start for two days, then repeats the above. It has gone through the same cycle 4 times now.

I have checked the fuel delivery and gas is coming out the main jet into the carburetor, but the spark plugs are dry. Also, I am getting no spark.

Any ideas?


Thanks for the help. I located the problem at the ignition switch. I cleaned the corrosion off the connections and it started right up. Apparently, the kill switch was intermitently shorting out.
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