Valve Clearance Adjustment - Polaris 1999 Sportsman 400 Service Manual

84
9. Check the cleara nce of the remaining intake
valve .
NOTE
A single common rocker arm (Figure
82) contro ls both exhaust valve s. nro
flat f
eeler gauges are necessQI}' to
check the exhaust
valve
clearance.
This
will
prevent the rocker arm f rom
tilting slightly during the next step.
10. Insert metric feeler gauges of variou s thick -
nesses between each exhaust valve stem and rocker
ann adjust screws.
a. When the correct gauge is selected, there will
be a slight resistance on the feeler gauge
when it is inserte d and withdrawn .
b. Reco rd the clearance and identify the valve
checked (right or left exhaust va lve) .
II . If adjustment is requi red, refer to the ta ll'e
Clearance Adj ustment procedure.
12. If the valve clea rance is correct on all four
valves, perform the following:
a. Clean the gaske t surfaces of the cy linder head
and the cover. Inslall a new gasket to the cyl-
inder head cove r (Figu re 83) .
b. Install the cylinder head cover and tighten the
retaining screws to the torque listed in Table 5.
c. Install all rema ining components removed.
Valve Clearance Adj ust me nt
I. Use a 10 mm wrench (B, Figure 81) to loosen
the valve adj uster lockuut.
2. On the exhaust valves, leave both flat feeler
gauges in place between each rocker arm adjuster
sc rew and valve stem end. This
will
prevent the
rocker arm from tiltiug slightly duriug the tighten -
ing of the locknuts.
3. Use a
screwdriver
and turn the adjusterin or out
to obtain the correct clearance (Table 6).
4. Hold the adjuster with the screwdri ver (A, Fig-
ure 84 ) to preven t it from turning.
5. Install a to mm offset adap ter (B, Figure 84)
onto the valve adjuster locknut.
NOTE
Use an
offset
adapter to prevent
overtightening
the adj uster locknut.
CHAPTER T HREE