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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26042
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have a 25 horsepower Kohler when it gets up to operating

Customer Question

Hi my name is***** have a 25 horsepower Kohler when it gets up to operating temperature it shuts down
Submitted: 5 months ago.
Category: Small Engine
Expert:  Curtis B. replied 5 months ago.

Twin cylinder engine. Does it have the Kohler Oil Guard on the engine? That would kill the spark if oil switch closed. How long after it quits, will it restart?

Customer: replied 5 months ago.
Where was the oil guard be
Customer: replied 5 months ago.
It will not start till the next day it will run for about 20 minutes and shut down
Expert:  Curtis B. replied 5 months ago.

When it dies, have you checked for spark? Take a spare spark plug, and as soon as it quits, take the spare plug and and attach it to one of the spark plug wires, and with the spark lug grounded, see if it has spark. If it has spark, likley you have electric fuel solenoid in the carburetor shutting off the fuel supply.

Customer: replied 5 months ago.
I just put two brand new coils on it
Customer: replied 5 months ago.
Can I send u a picture of the carb and u can tell me witch 1 it is
Expert:  Curtis B. replied 5 months ago.

Sure

Expert:  Curtis B. replied 5 months ago.

# ***** in the above diagram.

Customer: replied 5 months ago.
Did u get the pictures
Expert:  Curtis B. replied 5 months ago.

No, did you see my link?

Customer: replied 5 months ago.
thank u I FD that does not work what is next
Expert:  Curtis B. replied 5 months ago.

It has to loose spark or fuel. I would remove the solenoid, and remove the inner parts, and re-install it to see if engine runs. Then I may just leave it like that!

Customer: replied 5 months ago.
I've got two solenoids one on the top of the starter and the small one
Expert:  Curtis B. replied 5 months ago.

This solenoid is on the side of the carburetor! Not the starter solenoid!

Customer: replied 5 months ago.
Okay how do I remove the inners
Expert:  Curtis B. replied 5 months ago.

Take a plier and rip it out! Re-install and do not hook up the wire, it will now just be a plug.

Customer: replied 5 months ago.
The pin came out is that the only thing that needs to come out
Customer: replied 5 months ago.
Okay I pulled the guts out of the solenoid and put it back together reinstalled it started the mower up let it run it's still shut off but when I go to restart it it acts like it wants to start but it will not
Expert:  Curtis B. replied 5 months ago.

Check the fuel supply to the carburetor, tank line may be restricted or the fuel pump may not be delivering the fuel.

Customer: replied 5 months ago.
OK I will do that first thing in the morning and let u know
Expert:  Curtis B. replied 5 months ago.

oK>

Customer: replied 5 months ago.
Hey Chris I replaced the fuel filter and all the fuel lines and still doing it
Expert:  Curtis B. replied 5 months ago.

Make a test fuel line from the fuel pump inlet, back into the fuel tank filler opening and run from test, with tank and outlet hose bypassed.

Customer: replied 5 months ago.
Ok
Expert:  Curtis B. replied 5 months ago.

Let's see what that does!

Customer: replied 5 months ago.
OK cool
Expert:  Curtis B. replied 5 months ago.

OK>

Expert:  Curtis B. replied 4 months ago.

I see question is still open, did you get to run test?

Customer: replied 4 months ago.
I did that test and everything was proper and still runs for 15 minutes and shuts down
Expert:  Curtis B. replied 4 months ago.

Has fuel and spark, but it won't start! The tank is venting if you ran test line into the tank opening, makes no sense! If it was an engine with solid valve lifters, valves could be too tight, but this engine has hydraulic lifters and need no adjustment. I'm at a loss, I can opt out and see if anyone can add anything. Sorry.