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Reload this Page Kohler KS540-3011 Backfires through Intake
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  #1  
Old 01-22-2025, 06:32 PM
AndyAndrews AndyAndrews is offline
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Unhappy Kohler KS540-3011 Backfires through Intake
Kohler KS540-3011 Backfires through Intake
1. Last used my Cub Cadet (model 13A0A1CS056) riding mower without a problem
2. Parked it for about two weeks
3. Tried to start it, cranks strongly but no start and . . .
4. Backfires explosively through carburetor
5. Check flywheel key - intact and no apparent problem shifting
6. Checked electric solenoid valve at bottom of carburetor - activates w 12V jump
7. Took off valve cover - rockers are operating when engine is rotated
8. Checked spark with tester on plug. Good spark
9. Removed and cleaned carburetor. Reinstalled.

I’m at the end of my knowledge base. Any and all suggestions will be greatly appreciated. Thanks to all.
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  #2  
Old 01-22-2025, 07:49 PM
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Billy-O Billy-O is offline
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Usually lean conditions will cause that.... I know you checked fuel solenoid and cleaned carburetor and all that, but, are you getting fuel? Good flow from the tank? Fuel filter?
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  #3  
Old 01-23-2025, 12:26 AM
AndyAndrews AndyAndrews is offline
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Usually lean conditions will cause that.... I know you checked fuel solenoid and cleaned carburetor and all that, but, are you getting fuel? Good flow from the tank? Fuel filter?
Billy-O - Thanks for your reply. Yes, I have checked fuel line and filter. Fuel is getting to carb.
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Old 01-23-2025, 07:18 AM
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ironman ironman is offline
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I would re-visit the flywheel key.
Did you actually pull the flywheel off and inspect the key.
My experiences have been that the key can shear and the flywheel rotates.
You can remove the nut and washer and see the key which looks like it is in place when it really isn't.
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Old 01-23-2025, 01:37 PM
AndyAndrews AndyAndrews is offline
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I would re-visit the flywheel key.
Did you actually pull the flywheel off and inspect the key.
My experiences have been that the key can shear and the flywheel rotates.
You can remove the nut and washer and see the key which looks like it is in place when it really isn't.
Ironman - I will be pulling the flywheel today! I told my wife when this started up that I hoped it was the flywheel key because it would be the easiest - and cheapest - repair. So . . . I REALLY hope that your suggestion is right!
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Old 01-23-2025, 07:08 PM
AndyAndrews AndyAndrews is offline
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Ironman - I will be pulling the flywheel today! I told my wife when this started up that I hoped it was the flywheel key because it would be the easiest - and cheapest - repair. So . . . I REALLY hope that your suggestion is right!
I pulled the flywheel and “unfortunately” the flywheel key is in perfect shape.

So - now I am starting to think about valves. Yikes!

Would a compression tester help me to narrow that down? Again I’m hoping one of you can give me an idea on the best path forward before I jump in and pull off the head - and very likely get myself in over my head!

Thanks again
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