Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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I have a KOHLER COMMAND 17.5 SCOTTS Lawn Tractor. I need to know the size of the spark plug and the size of a spark plug wrench to remove it. Don

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  • carter01377 Aug 21, 2010

    The engine is in a Scotts Lawn Tractor Manufactured by John Deere. The Model # is CV491S. The serial # is: 3206802173.

    The plug has been in the mower engine for about 1 1/2 to 2 years. I need the correct wrench to remove the current plug so I can clean it. I want the spark plug part # so I can purchase a spare.


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I need to know the model number and engine description to get you the correct spark plug part # for example it is a twin intek briggs & stratton 17.5 hp 2003 model #....etc.
Cant guess on this wrong plug can damage the engine.
What plug make and number is in the hole right now and was it running on that particular spark plug for a long time?

Posted on Aug 21, 2010

  • JOHN DAVIDSON Aug 23, 2010

    any markings on the engine as to who makes it....Briggs/Stratton Etc.?

  • carter01377 Aug 25, 2010

    Th engine is KOHLER COMMAND 17.5, Model # CV 491S, SER # 3206802173. It is in a Scotts Lawn Tractor manufactured by John Deere.


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Where is the spark plug?

The spark plug will be located on the engine under a rubber "boot". Remove this boot and you will see the spark plug. The boot is attached to the spark plug wire, you should be able to spot it pretty easily.

Grip the boot and pull it off, it will have a little resistance, but it should come off with no problem.

You will need either a spark plug wrench or a deep socket wrench to remove the spark plug itself.

Only use the tool the loosen it, then use your fingers when you can.

Good Luck!

I've added a link to a post about how to change the spark plug on a lawn tractor, unfortunately, it is not John Deere, but it should be very similar!

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I use a spark plug wrench or a deep socket and turn counter clockwise.

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Spark plug keeps getting soot on it

an indication of running rich . check that the air filter is clean and not blocked-- check that the choke control is off after starting--check float level and operation of needle and seat.

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Does my 2 cylinder kohler engine have a firing coil

Yes, some of them have covers that cover the coil. you may have to remove a cover or two. the best way is to locate the spark plug and then follow the spark plug wire back. most of these engines depending on the year will have the coil under the flywheel and they use a magnet to trigger and produce the spark. Again not sure the year but to remove the flywheel a puller is needed and you will have to remove cover, Most of these twin cylinder engines use two coils, one for each cylinder.
Here is a website that may be helpful in testing the coils. hope this is helpful. good day.

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1 Answer

Where is the spark plug located on my craftsman lawn tractor model 917.273360

James, it is at the front of the engine. It is next to the 4" by6" metal cover that says OHV. It is on the right hand side ( sitting on the tractor), There is a black wire the size of a pencil ( diameter ), hooked to it. It is set deep in the engines cylinder head. There is a rubber boot over the end of the spark plug. Remove the rubber boot, you will hace to grip it hard and pull it off. Then you will be able to remove it, using a deep 5/8" socket with a 4 to 6 inch extension.

Hope this helps, if you need more let me know.

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Motor runs for 5-10 min. then starts missing and quits.

Check your spark first,if you do not have spark your problem is the coils-if you do have spark the problem probaly lies withone of your valves getting stuck after getting hot and soonas it cools down a little it closes and then you can restart it till it gets hot again.Hope this helps

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1 Answer

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.

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