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  #1  
Old 06-11-2015, 03:47 PM
ganesa_9 ganesa_9 is offline
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Default Kohler SV470-620 backfire then won't start

I have a 2009 LTX 1045 that was running good up until this week. I had stopped to empty the clipping bag, got back on and turned the key, and heard four sudden backfires... then the engine wouldn't start. It turns over and the plug is sparking, fuel line is good and I'd replaced the fuel filter last summer... but I don't think I'm getting gas to the cylinder, or even to the carb for that matter. Any body out there have any ideas on what I could check next?

The sudden backfiring was weird, it had never done that before. Now there's no backfire and no starting.

Thanks for any help.
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Old 06-11-2015, 04:24 PM
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_DX3_ _DX3_ is offline
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Sounds like the electric solenoid for the carb has gone bad. This solenoid shuts off fuel flow when engine is shut down to keep the engine from backfiring when it is turned off. It has a plunger inside that opens and closes the fuel flow. They usually go bad with the plunger in the closed position. You can do one of two things. You can replace the solenoid, or you can remove the solenoid and cut the plunger off. This won't hurt the engine, just simply let the engine idle down a couple of minutes before you shut it off to keep from getting that big backfire that happens when the cylinders are overloaded with fuel. You can double check the solenoid when you remove it by applying 12 volt current to the electric lead and ground the body. If working you will see it work. It should open when current is applied and close when current is removed.
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Old 06-11-2015, 04:26 PM
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A couple of pics showing the solenoid and possible location..

solenoid.jpg

carb.jpg
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Old 06-11-2015, 04:35 PM
ganesa_9 ganesa_9 is offline
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Thanks... that's kinda what I was thinking (downloaded the service manual for the engine and checked the troubleshooting section). The picture is a HUGE help since I found the solenoid but had no idea how to remove it off. Looks threaded. I'll give that a try.
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Old 06-13-2015, 12:03 PM
ganesa_9 ganesa_9 is offline
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Default Tried the solenoid trick and it didn't work...

So today I took the solenoid off the carburetor and cut off the plunger, and then put the solenoid back on. It still turns over like a champ, and the plug is set correctly and sparked when I had it out, but the thing still won't start...

My sniffer isn't the best, and I'm not certain how much gas I should smell in the cylinder when I remove the plug, but it seems to me I'm not smelling any gas. Is it time to remove the carb and try cleaning it? Is there any other reason the engine won't start?
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Old 05-25-2021, 12:47 AM
koonak koonak is offline
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Default Cranks but won't start.

Mine is doing the same thing. The spark plug is dry but there is plenty of gas in the carburetor. I'm stumped.
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Old 05-25-2021, 07:07 AM
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Leadslingingdaddy Leadslingingdaddy is offline
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How about giving it a shot of Carb Cleaning and see if it pops off?? Pretty simple test...

Also that's a Courage engine... Not the best track record... What's the compression like?
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Old 05-25-2021, 07:23 AM
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Carburetors don't suddenly go bad between shutdown and startup a few minutes later.
The backfiring would lead me to suspect a sheared flywheel key.
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Old 05-25-2021, 09:21 AM
rwairforce rwairforce is offline
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The compression check is a good idea. Make sure something didn't pop on the inside. My son-in-law had one of those with 133 hours on it. His popped once and blew the side of the engine out. His was more obvious but still the unexpected surprise these engines seem to provide.
If you don't have a compression tester just pull the plug and place a pencil in the cylinder and turn the flywheel by hand and watch to see if the pencil moves. If it doesn't your connecting rod isn't connecting any longer.
Just my thought. Trying the carb cleaner down the carb throat is also a good test. Without compression it isn't going to fire.
Good luck.
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