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Reload this Page Misfire at full throttle K341
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  #1  
Old 01-22-2023, 09:34 PM
MitchJ MitchJ is offline
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Join Date: Mar 2018
Location: Ohio
Posts: 50
Default Misfire at full throttle K341
Hello, my Kohler K341 in my cub cadet 1650 will misfire at full throttle. It seems like it’s running rich because when it misfires it will belch Black smoke, but I have leaned the main jet back as far as I can so that it still runs at full throttle. Otherwise it runs at idle and mid throttle just fine and has good power. The misfire mostly occurs when I’m pushing snow or doing some heavy work. Any suggestions? Thank you in advance
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Old 01-22-2023, 10:43 PM
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Tim.E Tim.E is offline
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Location: Grandview, Tennessee
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Possibly a weak spark.
1. Check, clean, set your contact points,
2. Try a new condenser. (some guys run 2 condensers)
3. Try a new plug wire.
4. Try a new coil.
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Old 01-23-2023, 08:23 AM
R Bedell R Bedell is offline
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Could be your Carburetor is in need of cleaning, rebuilt, and/or adjusting.

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Old 01-23-2023, 09:28 AM
mrfred54 mrfred54 is offline
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If you don't find any issues with the ignition or carburetor then possible weak valve springs. Had a 147 years ago that would idle perfect up to bout 1/4 throttle but 3/4 to full throttle it would backfire through the carb. Problem was the intake valve spring was very weak and would allow the valve to start floating and not closing tight at full throttle. New springs and lapped the valves and no more backfire
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Old 01-23-2023, 06:43 PM
MitchJ MitchJ is offline
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Thanks- the carb is new and very clean- I did check it recently. And it was running perfectly recently- but it may be ignition
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Old 01-23-2023, 06:43 PM
MitchJ MitchJ is offline
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Thanks- I will check all of these-
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