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

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My CH25S Kohler engine won't start, but when I take the spark plug out of number 1 head the engine will start. What is wrong?

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Posted on Jan 02, 2017

  • 395 Answers

SOURCE: I have a 1997 Kohler Command CH25S in my small

Even though the engine is 13 years old but has low hours it could just be that the rings are gummed up and sticking in the groves and not doing their job properly. Before you consider pulling the engine apart for a ring replacement and bore hone, you could try this procedure.
Remove spark plugs and pour some engine flushing product like Wynns or Nulon into each cylinder. Turn engine over by hand to distribute the flush around the pistons and allow to sit for a day or so turning the crank occasionally and adding small amounts as the flush drains past the rings. The flush should soften any build-up of gum around rings and the bore. Before replacing plugs use a torch to see that there is not excessive flush sitting on top of pistons. If so wind over with starter to blow out excess. Replace plugs and put any remaing flush in sump and then fast idle engine until hot and then drain and replace oil and filter (if one fitted).
However if rings are badly worn there may not be much improvement and it is possible the oil use will increase. The cylinder with the badly fouled plug may also have a broken ring/s. Oill changes should be done every year or after 50 hours running, whichever comes first.
Let me know how you get on by posting a comment. Myki R

Posted on Oct 19, 2010

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What fuses to check for 2007 flht that won't start


Hi Anonymous, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections.
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
14. Security alarm system not disarming.
For a primary suspect please visit the website below: Good luck
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Jul 23, 2012 | 2007 Harley Davidson FLHT Electra Glide...

1 Answer

Engine won't fire. Starter turns over, but, won't run


Hi Anonymous, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections especially the "GROUND" cable to the frame.
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
14. Security alarm system not disarming.
For a primary suspect please visit the website below. Good luck and have nice day.
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Harley Diagnostic Codes 04 to Present

Jul 23, 2012 | 2007 Harley Davidson FLHT Electra Glide...

1 Answer

Kohler 149 cc engine won't start seems to be getting no fuel


This may not fix your problem but it does deal with that engine. I just tried to replace the spark plug in that engine and it took me 5 hours. The Kohler plug in the engine that came from the factory cannot be found in traditional stores and it is a strange size, 11/16 or 12 mm. The Kohler plug is #1413211. I could not find a match in a book. Divine intervention lead me to a place where they were fixing the Kohler 149cc engine that had the same plug in it that mines did. I discovered that a Champion 8815 does fit the engine but it takes a 18mm socket. It did fix the problem and the mower works. Hopefully this will save someone my hassles.

Apr 28, 2012 | Garden

1 Answer

'95 Jimmy 4.3L won't start unless plug wire is removed


every possibility that the timing ( firing order) is wrong from what you describe
bring the engine to tdc no1 piston on compression and that is no 1 plug lead in the distributor cap

Mar 15, 2017 | Cars & Trucks

2 Answers

I have a 2000 kia sportage that cranks but will not start what might it be?


When en engine won't start, there could be a number of things wrong. An engine requires air, fuel, and spark to start. You need to start by checking for spark. Take out one of the spark plugs and plug it back into the wire. Have somebody else turn the key while you hold the plug up to something metal on the engine, right next to the spark plug hole will be fine. You should see a bright blue spark, if you don't then you probably need to replace the spark plugs. You can do this same thing with any of the spark plugs. If you don't have spark on any of the plugs, get back with me and we'll go from there.

Jun 22, 2011 | 2000 Kia Sportage

1 Answer

2003 Harley Electra Glide Ultra cranks but won't start. Changed coil and plugs and it started right up. Drove 100 or so miles and now it just cranks and won't fire.


Hi Gloriane, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections especially the negative cable at "BOTH" ends
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
14. Security alarm system not disarming.
For a primary suspect please visit the website below. Good luck and have nice day.
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Jun 18, 2011 | Harley Davidson DNA 50 Motorcycles

1 Answer

Was riding bike and was stopped at a red light when it made a loud noise and died, now it won't start. The engine cranks and turns over but won't start.


You didn't say what year and model the bike was but on any four stroke engine, you must have three things for the engine to run. You need fuel, spark, and compression. The easy one to check is the fuel. Take your air filter off and make sure you're getting fuel to the engine. Then, check your spark. Pull the spark plug wires off the spark plugs in the head and insert another set of plugs in the wires. Ground the plugs against the engine, turn the ignition switch on and press the start button. Watch the plugs to see if you have spark. The next test is compression. With the engine cold, remove the spark plugs. If you have a compression gauge, connect it to one of the heads and spin the engine over with the starter. If you don't have a gauge, simply put your finger over the spark plug hole. Turn the throttle wide open and press the start button. You should show about a hundred pounds of compression if you have a gauge or the compression should blow your finger off the hole with a good deal of force if you're checking it that way. If you have all three of these and they're timed correctly, the engine should run. If the engine won't run, find out which of the three elements is missing and work from there.

Good Luck
Steve

May 21, 2011 | Harley Davidson FLHTC Electra Glide...

1 Answer

I have a 1997 Kohler Command CH25S in my small crawler tractor. It has 229 hours on the engine and it uses almost 1 quart of oil per hour! I checked the spark plugs and one is badly oil fouled. The...


Even though the engine is 13 years old but has low hours it could just be that the rings are gummed up and sticking in the groves and not doing their job properly. Before you consider pulling the engine apart for a ring replacement and bore hone, you could try this procedure.
Remove spark plugs and pour some engine flushing product like Wynns or Nulon into each cylinder. Turn engine over by hand to distribute the flush around the pistons and allow to sit for a day or so turning the crank occasionally and adding small amounts as the flush drains past the rings. The flush should soften any build-up of gum around rings and the bore. Before replacing plugs use a torch to see that there is not excessive flush sitting on top of pistons. If so wind over with starter to blow out excess. Replace plugs and put any remaing flush in sump and then fast idle engine until hot and then drain and replace oil and filter (if one fitted).
However if rings are badly worn there may not be much improvement and it is possible the oil use will increase. The cylinder with the badly fouled plug may also have a broken ring/s. Oill changes should be done every year or after 50 hours running, whichever comes first.
Let me know how you get on by posting a comment. Myki R

Oct 19, 2010 | Kohler CH25 PA-CH730-0040 Command Gasoline...

1 Answer

Kohler cv15 no spark at the plug.


If you disconnected the stop wire it is a coil ground wire and still cannot get a spark to the head at about 1/4 inch from the head the coil is bad. The only other thing could be a broken or loose magnet under the flywheel but that is very very rare.

Aug 24, 2009 | Kohler CH25 PA-CH730-0040 Command Gasoline...

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