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  #1  
Old 08-12-2002, 02:00 PM
Westbrooklawn Westbrooklawn is offline
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Join Date: Apr 2002
Location: Durham, NC
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Rough running kohler command 20

I have a Walker GHS mower with a Kohler Command 20 engine. It has about 600 hours on it. It just started to run rough, lack power, spit, sputter, and occasional light backfire/miss while running......almost acts like it is partially choked. Is this a common problem with these engines? Filters, plugs, fuels, etc. have always been maintained properly.

I am going to start by replacing the gas filter, air filter, and plugs. If this doesn't help where should I look next? This Problem started after some heavy mowing which really put a load on the machine. Is there a possibility of overheating problems......possibly burnt valves???

Would appreciate any thoughts.
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  #2  
Old 08-13-2002, 03:42 PM
olfrt olfrt is offline
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Location: Central Flordia Polk county area
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Start with the air filter and do one thing test run then to another to figure which one solves the problem
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  #3  
Old 08-14-2002, 10:24 AM
Westbrooklawn Westbrooklawn is offline
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Help! Kohler Command 20 problem

Still having rough running problem with my Kohler 20 command on Walker 48" GHS. Spits, misses, light backfires while running, particularly at 1/2 to 3/4 throttle. I have replaced air filter, gas filter, drained and cleaned gas tank, and replaced plugs.

What next?
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Old 08-14-2002, 12:38 PM
olfrt olfrt is offline
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Location: Central Flordia Polk county area
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was there water in the filter or the tank?

You may have some water in the carb bowl.

Check your seat switch especially if it happens on hills or slopes

Check the throttle plate to see if the throttle cable is pushing the choke part way closed. I have seen the wire end catch the choke plate on the throttle/ choke bracket and move it.
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  #5  
Old 08-14-2002, 01:26 PM
Westbrooklawn Westbrooklawn is offline
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Location: Durham, NC
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Thanks for the hints. I didn't see any water in the gas or the filter, although there was a lot of fine trash in the gas tank. It isn't the seat switch since it does it without the blade engaged. The choke plate position and linkage is O.K.

Is it relatively simple to take this carb apart and get it back together? Maybe I should try that. Any additional hints would be appreciated.
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  #6  
Old 08-14-2002, 08:23 PM
KenH KenH is offline
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Location: CT
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Shut off the gas, take the carb. bowl off, clean it out, and run some gas through the lines. This will get out any dirt, ets.
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  #7  
Old 08-15-2002, 08:46 AM
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thfireman thfireman is offline
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Location: Charlotte, NC
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I had a simular problem last year. I tried everything and then finally replaced the entire fuel line. It seems that the inside of the fuel line had collaped or become narrow and it was not letting sufficient fuel flow through. My mower would start and run fine for a minute and then start acting like the choke was pulled or it was running out of fuel. The new fuel line fixed it.

Also you might check the needle and seat if you have not already done so. If the seat in the carb is bad it may load up with fuel.

You may have already tried these things but thats what helped me.
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Old 08-23-2002, 11:23 PM
edward hedrick edward hedrick is offline
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Location: Trumbull,ct
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Check the coils I have a 22 Koh on my scag same engine as 20hp

tried filters and gas, turned out to be elec. check dealer
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  #9  
Old 08-24-2002, 05:41 AM
TJLC TJLC is offline
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Location: Port Charlotte, FL
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My 18 Kohler is starting to run rough once it gets good and hot, mainly after it gets hot and then I shut it down and start it up again. Then it acts like it's running on one cylinder. I don't know if this is the problem you are having or not. My dealer says it's probally the coils.
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