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Old 11-24-2012, 07:02 PM
HenryB HenryB is offline
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(Exmark) Kohler 20 hp Command smokes at startup, accelerating and decelerating?

Title says it all lets out white some on these three occasions. Once running no smoke
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Old 11-24-2012, 07:14 PM
Monroe74 Monroe74 is offline
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(Exmark) Kohler 20 hp Command smokes at startup, accelerating and decelerating?

Sounds like leaky valve seals
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Old 11-24-2012, 07:27 PM
HenryB HenryB is offline
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Hard to repair?
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Old 11-24-2012, 07:32 PM
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CowboysLawnCareDelaware CowboysLawnCareDelaware is offline
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How many hours on the engine, you may want to rebuild the motor?

Michael
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Old 11-24-2012, 07:35 PM
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piston slapper piston slapper is offline
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How much oil is it using..?? What do the sparkplugs look like..??
The rule of thumb is....
If it smokes while throttling up....its bad rings..
If it smokes when throttling down...its a leaky head gasket...
Check your compression....normal is 180 psi....
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Old 11-25-2012, 08:49 AM
Monroe74 Monroe74 is offline
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(Exmark) Kohler 20 hp Command smokes at startup, accelerating and decelerating?

Valve seals are pretty easy to do you will need to remove the valve springs from the head one at at time but in doing so use compressed air to keep the valve in the closed position. With time and exp this should take half hour each cyl
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Old 11-25-2012, 08:54 AM
Monroe74 Monroe74 is offline
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(Exmark) Kohler 20 hp Command smokes at startup, accelerating and decelerating?

The reason I say it's valve seal is because you said it happens at start up. Then accel till it warms up. Oil collects in the head then drains into cyl when it starts it burns the oil.
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Old 11-25-2012, 08:57 AM
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ericg ericg is offline
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20 HP smoking

There is a valve stem seal only the intake valve on these engines.
I agree with PistonSlapper that you should perform a compression and or leakdown test.
The results of those tests will tell the true story.
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Old 11-25-2012, 09:32 AM
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Valve seals will not give you these problems on a Command twin...
The drain in the head would have to be clogged to get the oil level high enough in the valve cover to drain thru the valve guides..
A broken reed valve is always a possibility on smoking issues...but not on startup..
A headgasket leaking at the oil drainback hole could leak a small amount of oil into the cylinder when it is not running....probably the case...
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Old 11-25-2012, 10:29 AM
Monroe74 Monroe74 is offline
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(Exmark) Kohler 20 hp Command smokes at startup, accelerating and decelerating?

Not saying your wrong. It's what fixed my 27hp Kohler command.
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