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What are the model and serial numbers of the genset?
First, the plug gap is way too wide at .035" - close it up to .020"
If that does not let the engine start, try this:
Remove the air cleaner.
Pour in about 2 teaspoons of gasoline (it will not hurt the engine).
Try to start it now.
Will it start on gasoline?
I am positive it won't hurt the engine - remember, the only difference between this engine running on gas, LP or NG is the carburetor, and different gap setting on the plugs.
I have never heard of a Generac running .040" on the plugs - that's REALLY wide.
The owner manual for your set specifies .020"
Let me know what happens.
I see that you have opened another question.
Please keep all correspondence to this question, and I will have the other question closed.
Do you have a multimeter to do some checking with?
Have you regapped the spark plugs to .020"?
If not, do that first,
If you have, remove the air cleaner.
Set the switch to "MANUAL".
While cranking, the choke plate should close for 2 seconds, then open for 2 seconds, and keep repeating until the engine starts.
Does the choke plate move like this?
You are going to need to test the choke.
First, see if you can manually move the choke linkage - it should move freely without sticking or binding.
If it does, disconnect the plug from the choke solenoid, and use your meter to check and see if you are getting 12V to the solenoid while the engine is cranking.
Yes, you can follow the choke linkage directly to it.
You should not need to remove the air housing to access the plug.
You may need a small inspection mirror to see it, though.
I'm a little confused here.
I went back to the book to double check the wire numbers.
I could not find the choke solenoid at all.
So I looked at a different book - and it clearly shows the choke solenoid as being there.
One book says this unit has a CS, and the other does not.
Does your set actually have a choke on it or not - or are you simply seeing the throttle plate?
If the choke would be controlled directly by the control board, but the throttle is a mechanical governor. It has nothing to do with the control board.
Have you had your gas pressure checked?
When was the last time this set had a valve check done on it?
There is no timing adjustment.
Timing is accomplished by the position of the magnet in the flywheel - which is cast in at the factory.
Your set may not have a choke on it - if you only see one butterfly, it is the throttle.
I would first check the valves - all should be set at .003"
If the valves are good, you need to have the gas pressure and secondary regulator checked.