Kohler back fires though carb

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Old 10-13-19, 09:27 AM
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Kohler back fires though carb

Kohler CV490. Initially gas would shoot from the exhaust when starting, but it ran okay. Now it will not start, but backfires through the carb when trying to. I have installed a new carb and plug, and confirmed spark at the plug. Also you can feel compression at the plug port, and smell gas on the plug. Suggestions? Thanks!
 
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Old 10-13-19, 10:37 AM
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With the new carb the gasoline out the exhaust stopped and the backfiring through the intake started? Or is there a different order of events?
 
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Old 10-17-19, 05:51 PM
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There was backfiring with both carbs. Thanks!
 
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Old 10-17-19, 07:03 PM
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It could be the valve lash is off or a stuck intake valve, or a flywheel key sheared. The key would allow the flywheel to advance on the crankshaft messing up the timing.

Flooding an engine can get a backfire like that, but I would check the valve lash first.
 
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Old 10-17-19, 10:07 PM
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Generally that's caused by a sheared flywheel key on these engines.
 
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Old 10-18-19, 05:48 AM
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Have you checked the gap between the ignition module and the flywheel? Should be about 0.010 inches.
 
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