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

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No spark either coil on CH25 Kohler

Checked all safety switches, OK. Have 12V at Speed control module going in, however, no power coming out. Checked for power with key in on position and cranking positions. Is there a test to confirm the speed control module is working?

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SOURCE: not charging battery no power on stator wires?

With engine off, check continuity through the stator winding. you should have continuity both ways if testing before the diode. If testing after the diode, and you still have continuity both ways, then your diode is blown and needs to be replaced. If you don't have continuity through the stator windings, then stator is defective.

Some models have a fuse in the charging circuit, look for that as well and test with a meter, don't assume visually.

Posted on Jun 12, 2010


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I just changed a head because of a popped valve seat, put it back together and had no spark, turns over but no spark. Checked for loose connections, wires, safties, but still no spark.

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I’m happy to assist further over the phone at

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I have a 1 year old kohler command pro ch740s. i pulled plug wire off one side and cant get any spark. i pulled other side off and motor dies. can you tell me what would cause one side not to get any spark

hi there, pauly46 here

from your model type ch730 25 hp 0040 it seems that
this model does not need or use a smart spark ignition module

please check that you dont have a kill wire from your coil groundin somewhere between kill tab on your coil and the ignition switch

then if you still have no spark replace the ignition module
that has no spark - your engine has been running one 1 cyl
as soon you pulled the h t lead off the firing cyl the engine died
that tells you no fire on other side

i am sure these units do not use any diodes fitted between l/h and r/h kill wire tabs leading back to ignition switch , i think these are mainly on briggs vee twin

here is web site for service manual

enter as guest on the site
go to command pro twin
go to service manual section
select SM-24-690-07 ( replaces tp-2450c) from the list
download a copy and print

cheers hope it helps


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