Kohler Command wants to quit running stumbling when hot

Messages
26
Location
Raleigh-Durham NC
Thread starter
I have a 19 year old Simplicity riding mower with a Kohler Command 15 hp engine . Has near 700 hours on it, after maybe 1 hour mowing starts stumbling and today cutoff. I came in and had dinner and after cooling started right up and I finished mowing no issue.I have checked [color:#3333FF][/color]the carburetor no trash. This started showing up about a month or so ago.Could it possibly be the ignition module failing or the spark advance module. Something is getting hot and starting to fail. Any ideas what it maybe what I should check don't want to just throw parts at it. Thanks,
 
Messages
35
Location
belle chasse
I have the 16HP variant CV16 Kohler Command and I get something very similar. When it heats up after 10 min or so I loose power and when it stumbles uder load I get a backfire. I also thought it was the ignition coil and spent $65 on a new one.....no dice. I changed the carb.....no dice.....hydraulic valves so there is no adjustment there.....governor seems to be advancing throttle under load so that's good. New fuel lines, filter, gas cap, spark plug, air breather/filter.....So now I'm thinking possible head gasket.....Mine is 20 years old with 770 hours on it. Does not burn oil or smoke at all.
 
Messages
4,149
Location
N.C.
You might also make sure there's no dirt, dried grass clippings etc blocking the cooling air in and around the engine tins. I blow mine out with either compressed air or a leaf blower several times each Mowing season.
 
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Messages
415
Location
Kevil,Ky
Sounds like vapor lock. Winter or summer gas in there? My Briggs does the same when I try to use my winter generator gas in it.
 
Messages
686
Location
Indiana
I had to replace the ignition coil on a CV15 engine last year. Bought it off amazon for around $15, so it's a cheap part to throw at the problem.
 
Messages
2,700
Location
USA
+1 on the mouse nests. If you haven't yet taken the top cover off to check the cooling passages, that's the first step.
 
Messages
105
Location
VA
We had an early 90's Simplicity Broadmoor with the 14hp Kohler and had to replace the ignition coil. I need to replace the one on my Briggs opposed twin due to hard starts when it's hot and has been running for awhile it is a pain to get running again so I either let it cool down or just leave it running if it's only going to be a few min, common problem on those Briggs as they get heat soak and overtime it causes it to break down. I suspect that Kohler has it's own issues with these as well from the sounds of it. Video on how to replace it on a Kohler. https://www.youtube.com/watch?v=kAVubYlhAwM
 
Messages
8,873
Location
Marshfield , MA
To the OP please post your progress, This generation of Kohler is better than the equivalent B+S and after mkt parts are readily available for it and the Craftsman/Husqavarna/Electrolux/etc mowers. The fuel line between the fuel pump and the carb runs under the tin against the engine. Potential for a mouse house is big. When I got my LT1750 Craftsman home it had a new born mouse crawling out of it.So I knew. Probably saved me from what you're going through. grin2
 
Messages
26
Location
Raleigh-Durham NC
Thread starter
Ok,I removed the fan housing from my 19 year old Kohler CV-15 Command engine. First time I have had to remove it, Glad to say No mouse house! There was some crud buildup inside the fan housing around the starter and maybe 1/3 the way around the housing. Cleaned every thing up rolled the mower outside the garage. Used the air compressor blowed all the dirt and dust and used brake clean and a rag cleaned everything up. The cylinder and head was rather clean. I ordered a Kohler ignition module and replaced the spark plug. Cut the yard today and I am glad to say the engine ran great and the module seams to have corrected my issue of missing after it got good and hot. Thanks all.
 
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