Polaris 1999 Sportsman 400 Service Manual page 106

100
not accidentally make contact with the battery ter-
minal.
3. Remove the spark plug as descri bed in Chapler
Three. This will make it easier to rotate the en-
gine.
4.
Remove the p lug
from
the tim ing inspect ion
hole (Figu re 19).
5. Position the piston at top dead center (TOe) on
the compression stroke as follows:
a. Using the recoil starter, slowly pull on the re-
coil handle and observe lhe opening and clo s-
ing of the va lves.
b. Stop ro tating
the
eng ine w hen bot h
sets
of in-
take and exhaust valves are c losed.
e. Verify
that
the two raised pins on the cam-
sha ft sprocket a re parallel with the rocker ann
cover gasket surface (Figu re 20) . The cam-
shaft lobes should be fac ing down awa y from
the rocker arms.
d. Wiggle all
four rocker arm
s, Ihere should be
tree p lay indic ating that all four va lves are
clo sed . T his indicates that the pislon is at lop
dead cen ter (TOe) on the compress ion stro ke
and all four valves arcclosed.
e. Check that the flyw hee l tim ing mark is
aligned with the
center
line mark inthe timing
inspec tion hole (F igure 21) in the reco il
starter cove r.
6. If the rocker ann assembly is going to be ser-
viced, loosen the rocker shaft retaining screw (Fig-
ure 22) .
CAUTION
Account jar the dowel pins when re-
moving the rock er arm assembly.
7. Re move Ihc foul' bolts (F igure 23) securing the
rocker ann shaft brackets.
CAUTION
Hold onto the rocker arm ass embly, as
it will separate
aft er
being removed
f rom the
cylinder
head. Do not
drop
allY
oft he components.
8. Pull straight up and lift the rocker
anTIS
and shaft
assembly fr om the cy linder head . 00 not lose the lo-
cating dow
els.
CHAPTER FOUR