Engine Tune-Up; Cylinder And Cylinder Head Nuts; Cylinder Compression - Arctic Cat Cougar Service Manual

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ENGINE TUNE-UP
The number of definitions of the term "tune-
up" is probably equal to the number of people
defining it. For the purposes of this book, a
tune-up is general adjustment and maintenance
to ensure peak engine performance.
The following paragraphs discuss the different
parts of a tune-up. Perform them in the order
given. Have the new parts on hand before you
begin.
To perform a tune-up on your snowmobile,
you need the following tools and equipment:
a. 14 rnrn spark plug wrench.
b. Socket wrench and assorted sockets.
c. Phillips screwdriver.
d. Spark plug wire feeler gauge and gapper
tool.
e. Dial indicator.
f. Flywheel puller.
g. Compression gauge.
Cylinder and Cylinder Head Nuts
The engine must be at room temperature for
this procedure.
1. Open the hood.
2. Tighten each cylinder head screw or nut in a
crisscross pattern to the tightening torque in Ta-
ble 7. Refer to Figure 46-50.
Cylinder Compression
A cylinder compression check is one of the
quickest ways to check the condition of the en-
gine by measuring the compression built up in
the cylinder. It is a good idea to check compres-
sion at each tune-up, record the compression of
each cylinder, then compare the current corn-
pression with test results from earlier tune-ups.
The first step is to write the measured compres-
sion of each cylinder and the date, so it can be
compared with tests recorded at the next tune-up.
CHAPTER THREE
A gradual change may indicate normal wear or
may help you spot a developing problem.
1. Elevate and support the machine so that the
track is completely off the ground and free to
rotate. Start and run the engine until it warms to
normal operating temperature, then tum the en-
gine off.
WARNING
Do not stand behind or in front of the
machine when the engine is running, and
take care to keep hands ,feet and clothing
away from the track when it is turning.
CAUTION
To prevent expensive engine damage, use
compressed air to blow away any dirt
that has accumulated next to the spark
plug base. The dirt could fall into the