Kohler CV1000 User Manual download pdf (Page 99)

Section 9

Inspection and Reconditioning

9.7

Excessive Combustion Temperatures: The white

deposits seen here indicate very high combustion

temperatures, usually due to a lean fuel mixture.

Gum: Gum deposits usually result from using stale

gasoline. Gum is a prevalent cause of valve sticking.

The cure is to ream the valve guides and clean or

replace the valves, depending on their condition.

Stem Corrosion: Moisture in fuel or from

condensation are the most common causes of valve

stem corrosion. Condensation occurs from improper

preservation during storage and when engine is

repeatedly stopped before it has a chance to reach

normal operating temperatures. Replace corroded

valves.

Overheating: An exhaust valve subject to overheating

will have a dark discoloration in the area above the

valve guide. Worn guides and faulty valve springs

may cause this condition. Also check for clogged air

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Kohler CV1000 User Manual Page 99