Sea-doo RX Shop Manual page 227

Fouling
Fouling of the spark plug is indicated by irregular
running of the engine, decreased engine speed
due to misfiring, reduced performance, and in-
creased fuel consumption. This is due to a loss of
compression. Other possible causes are: pro-
longed idling, or running on a too rich mixture due
to a faulty carburetor adjustment or incorrect fuel.
The plug face of a fouled spark plug has either a
dry coating of soot or an oily, glossy coating given
by an excess either of oil or of oil with soot. Such
coatings form a conductive connection between
the center electrode and ground.
Spark Plug Analysis
1. Overheated (light grey)
2. Normal (brownish)
3. Fouled (black)
The plug face (and piston dome) reveals the con-
dition of the engine, operating condition, method
of driving and fuel mixture. For this reason it is
advisable to inspect the spark plug at regular inter-
vals, examining the plug face (i.e. the part of the
plug projecting into the combustion chamber) and
the piston dome.
SMR2000-060_09_02A.FM
Section 09 ELECTRICAL SYSTEM
Spark Plug Installation
Prior to installation make sure that contact surfac-
es of the cylinder head and spark plug are free of
grime.
1. Using a wire feeler gauge, set electrode gap ac-
cording to the following chart.
2. Apply anti-seize lubricant over the spark plug
threads to prevent possible seizure.
3. Hand screw spark plug into cylinder head and
tighten with a torque wrench and a proper socket.
1. Proper socket
2. Improper socket
Spark Plug Chart
ENGINE
947
NOTE: Refer to next page for NGK Spark Plug
Symbol Explanation.
www.SeaDooManuals.net
Subsection 02 (IGNITION SYSTEM)
TORQUE
SPARK
N•m
PLUG
(lbf•ft)
NGK
24 (17)
BR8ES
GAP
mm (in)
0.5 - 0.6
(.020 - .024)
09-02-11