109
MAINTENANCE AND LUBRICATION
Minor Maintenance
Spark Plugs
Always use the spark plugs and
gap recommended on page 12.
Gap thickness (1) should be
measured with a wire thickness
gauge.
A slightly brownish tip is considered good. The engine is running
properly and the carburetor is adjusted correctly.
A black tip indicates several potential problems: the wrong spark plug
(wrong heat range) is being used; excessive idling; carburetor idle
speed mixture or high speed mixture is too rich; or there is a
malfunction with the RPM limiter.
A light grey or white tip indicates: the wrong spark plug (wrong heat
range) is being used; carburetor idle speed mixture is too lean; there is
a plugged fuel filter; or there is a leaking engine seal or gasket.
A yellow tip is caused by salt water mist ingestion. This is a
conductive coating which will eventually cause fouling. This is a
normal situation.
1
If the engine in your boat requires a resistor plug, (For Example:
in BPR8ES, the R indicates it is a resistor plug), never substitute
a non-resistor spark plug.
CAUTION
If the spark plug tip is black or grey have the watercraft serviced by
an authorized Polaris dealer as soon as possible.
CAUTION
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