Question about Kohler CH25 PA-CH730-0040 Command Gasoline Engine

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Kohler cv492s wont start. fuel and spark o.k. compression 90psi. splash little fuel in carb. no change.

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Posted on Jan 02, 2017

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SOURCE: 15 HP OHV Kohler engine with no compression

Have you checked for a bad head gasket?

Check the intake valve springs or the intake valve shafts to be sure they aren't stuck open. Another cause could be excessive carbon build up on the intake valve causing them to not seal.

If you've gone this far, you could try a compression leak down test. If you still have the push rods out, you can use or get an adapter that will allow you to pressurize the cylinder(s) with air by removing the spark plug. Apply 70-80 psi air directly to the cylinder (the cylinder may go to BDC (bottom dead center) but if you don't have any push rods, the valves can't open.

Listen carefully - if you hear air leaking out of the carb, it's a bad intake valve. If you hear air from the exhaust, it's an exhaust valve. If you hear air from the crankcase breather, it's piston rings.

Posted on May 03, 2009

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Simplicity 16hp kohler runs fine shut it off will just crank has spark and fuel? Interlock module?


give it a shot of carb cleaner in the carb. if it fires you have a fuel problem. if not change to a different spark plug see if that starts it. if not check compression. and valves

Sep 27, 2016 | Garden

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What to do? I have a craftsman GT 5000 with a 25 HP Kohler and it will run for about 10 minutes and then start cutting out and die. I have changed the fuel filter with no resolve. What should I look at...


Make sure the choke is coming off. Check the compression.Many times the head gasket may leak when the engine heats up. Also check for spark sometimes the magneto can heat up and quit after running a while. See if it will run if you prime with a little fuel, if so ,some of the Kohler engines this size have a fuel pump that could be failing. Check for vapor lock. It takes air and fuel properly mixed, spark and compression any of these missing the engine dies.

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1 Answer

Turns over but wont start


have you got 90psi or more compression ? spark on both plugs ? carb clean ?

Mar 29, 2014 | Yamaha XS 500 Motorcycles

1 Answer

I have a kohler 12.5 in my J.D. STX38. Starts and runs good but has a slight miss on low idle. It may have it at high idle but you cannot notice it. The carb has been taken apart,cleaned, carb kit...



hi there harryandmeli
sounds like you still have a restriction in your carb or the float level is not right
check all the opening s and jets carefully, particularly main jet and emulsion tube air bleeds
and the idle air bleed , and idle jet, is the tank clean and no water ? , is the tank breather working ?, make sure gaskets at carb flange are ok - no leaking of air , make sure air filter is not blocked ?

provided compression and spark ok,( spark should jump a 6 mm gap minimum ) to pass a coil test and fuel flow from tank to carb is good , these engines have hydraulic valve lifters and like 10w/30 kohler oil , everything being = engine should run good

remember F A C T S

F = Fuel , A = Air , C = Compression , T = Timming , S = Spark

take a look

cheers hope it helps

pauly46

Sep 16, 2011 | Garden

3 Answers

MY SON HAS A TTR 125. IT WONT START. HAS NEW PLUG, NEW GAS, I JUST FINISHED REBUILD KIT ON CARB. ITS GETTING SPARK, ITS GETTING GAS IN SEDIMENT BOWL. IT WILL ACT LIKE IT WANTS TO START AFTER ABOUT 10...


A rebuild kit on a 2004? Why was that needed?
I would do a compression test to verify that the ring, and valves are working for you. Should be above 100 psi. (Throttle open while kicking it over) This may help get you started toward a fix.

Jun 09, 2010 | 2004 Yamaha TT-R 125 L

1 Answer

Suzuki gn125 wont start. checked carb, cdi, coil. got compression and spark but it wont fire. timing been checked. i have ran out of ideas.


Check the valve adjustment. If a valve is standing open just a little, the compression will be too low to start the engine. Check fuel delivery by dribbling a little gasoline into the carb and try starting the bike. If it starts and runs for a second or two, you're not getting fuel into the cylinders. Check you carb again.

Oct 18, 2009 | 2004 Suzuki DR-Z 125

1 Answer

32cc crafstman weedwhacker (2 yrs old)flooding wont start


Nope, it's not the carb. The plug is wet and probably black as well. Wet plug and lots of smoke means too much oil in the mix which is where the problem lies. Get a compression tester and look at the pressure reading; anything less than 90psi means the piston ring is stuck and needs to be replaced/cleaned.

Oct 07, 2009 | Garden

1 Answer

Weedeater will not start. was running, shut it off and then will not crank. I have checked all the obvious(spark plug and wire, has good fire, fuel filter and lines,took apart carb and cleaned good) still...


Pull the spark plug after pushing the primer bulb and cranking a few times...if the plug is "wet" (indicating fuel is present in the cylinder) then the next step will be checking the compression...compression should read above 90psi (preferrably 100-125psi)...if compression is below 90psi, the most likely culprit will be a stuck piston ring.

Sep 06, 2009 | Poulan/Weed Eater #Wt200 711724 24cc Gas...

1 Answer

Compression on 2000 polaris 250 trailblazer


the fuel could be good but still it wont spit check the carbs when you throttle or kick start if thats possible if that is good try some starting fluid it should start up and the fuel pump should get out the obstruction if theres more problems it is one of many things either bad fuel pump, your fuel line is disconnected, blown headgasket idk the psi specs for the 250 but that sounds good i know for the 550s its around 120 and so on

Apr 24, 2009 | Polaris ATV

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