85
MAINTENANCE AND LUBRICATION
Spark Plugs
Always use the spark plugs and
gap recommended on page 104.
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.
NOTE: If the spark plug tip is black or grey, have the watercraft
serviced by an authorized Polaris dealer as soon as possible.
A black tip indicates several potential problems: the wrong spark plug
(wrong heat range) is being used; excessive idling occurs; the
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 that the wrong spark plug (wrong
heat range) is being used; the 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
Engine damage could occur if a non-recommended spark plug is
used. 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
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