Johnson SKEE-HORSE 25-201R Service Manual page 30

5-4
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2. Function of compression release
3. Function of brake
4. Engine performance
5. Ski alignment and handling
6. After running snowmobile, reduce engine speed to idle and pull
neutral lockout knob out to lock transmission in neutral. Ac-
celerate engine to see if transmission is in neutral. Neutral
lockout is spring actuated, and cannot be engaged above approxi-
mately 2000 rpm.
b. Check compression as described above.
c. If engine knocks or does not come up to speed, check for loose
flywheel. Remove manual starter and fan housing (see Section 8).
Rock flywheel back and forth and listen for knocks .
Excessive wear in crankshaft journal bearings can be detected by
moving flywheel back and forth. Check for end play by pushing and
pulling on flywheel. End play tolerance is .011 to .026.
d.
If
compression and bearing condition checks are not satisfactory,
engine overhaul is required (see Section 9).
e. Test for adequate spark at each cylinder, using a spark checker.
Inspect and test points, condenser, magneto COils, ignition coils,
timing and spark plug high tension leads (see Section 7).
f. Check spark plugs to be sure they are the correct type. Clean
spark plugs and regap, or replace as necessary.
g. Check breaker pOints, and clean or adjust as necessary.
h. Remove and drain fuel tank, flush, and clean thoroughly (see Sec-
tion 6). Install tank, refill with fresh fuel mixture, and check
primer operation.
i.
Inspect fuel pump and hoses. Clean filter, or replace filter ele-
ment and gasket.
j. Inspect and clean fuel filter under carburetor fuel inlet elbow.
k. Thoroughly lubricate snow machine (see Section 12).
l.
Tighten all external bolts, nuts, and screws, and retorque cylinder
head nuts and spark plugs to specified torque.
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