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Kohler Courage model SV610S in Toro zero turn mower. Barley…

Customer Question
Kohler Courage model SV610S...

Kohler Courage model SV610S in Toro zero turn mower. Barley cranks over. Remove spark plug, cranks fine. Good spark from plug. Appears to be a compression problem. Possible that valve is stuck?

Mechanic's Assistant: What's the make and model of the mower? And can you guesstimate how old it is?

Toro model 74363. Approx 9 years old.

Mechanic's Assistant: Do you plan on doing the work yourself?

Yes

Mechanic's Assistant: Anything else we should know to help you best?

I have replaced a blown head gasket a year ago.

Submitted: 9 months ago.Category: Small Engine
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Answered in 1 minute by:
11/12/2017
Technician: Donald, Small Engine Technician replied 9 months ago
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2,600
Experience: I have 25+ years of experience repairing 2 & 4 cycle engines
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Hello. Thank you for choosing Just Answer. My name is***** will be happy to assist you.

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Technician: Donald, Small Engine Technician replied 9 months ago

Check your valve clearances. In most cases our problem is caused by your valves being out of adjustment.

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Technician: Donald, Small Engine Technician replied 9 months ago

This is why your engine spins faster after you removed your spark plug.

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Customer reply replied 9 months ago
What's the next step if valves are at proper clearance?
Technician: Donald, Small Engine Technician replied 9 months ago

There is one other possibility. If the compression release on your cam shaft has failed, this can also cause our problem. I would say valves first.

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