Arctic Cat 2015 ZR 5000 Service Manual page 59

Servicing Components
Thoroughly clean all non-electrical components in parts-
cleaning solvent; then remove any carbon buildup from
the cylinder head and piston dome.
Visually inspect all engine components for wear or dam-
age.
VALVES
CAUTION
If any valve is discolored or pitted or if the seating
surface is worn, the valve must be replaced. Do not
attempt to grind a valve or severe engine damage may
occur.
If valves, valve guides, or valve seats require servicing or
replacement, Arctic Cat recommends the components be
taken to a qualified machine shop for servicing.
1. Install the drive clutch; then using Drive Clutch
Spanner Wrench, rotate the engine two full revolu-
tions.
 NOTE: Rotating the engine two full revolutions will
ensure that any oil trapped in the tappet/shim is
purged to maintain an accurate clearance reading.
2. Rotate the engine until the camshaft lobe of the valve
being measured is directly away from the tappet.
3. Using an appropriate thickness gauge, measure and
record the intake and exhaust valve clearance of the
cylinder that is on the compression stroke; then
rotate the engine 360° and measure and record the
valve clearance of the other cylinder. Valve clearance
must be within specifications.
Valve Clearance (Cold)
15°-25° C Intake: 0.0039-0.0078 in.
(59°-77° F)
Exhaust: 0.0078-0.0118 in. (5000)
Exhaust: 0.0118-0.0157 in. (9000)
ZJ055A
 NOTE: When measuring valve/tappet clearance on
the exhaust valves, rotate the engine until the decom-
pression pin of the valve/tappet is activated; then
using a flat-nosed punch, carefully tap the decom-
pression arm until the decompression pin releases
the tappet.
 NOTE: At this point if valve/tappet clearances are
within specifications, servicing is complete. If any
valve/tappet clearance is not within specifications,
complete steps 18-20 of Disassembling before pro-
ceeding to step 4.
4. To select the correct replacement shim for an out-of-
specification clearance, note the three-digit number
on the surface of the existing shim; then refer to the
appropriate Tappet Shim Selection Table (Exhaust or
Intake) in this sub-section and use this procedure:
A. Find the Measured Tappet Clearance (from step 3)
in the left-side vertical column of the table.
ZJ105
IO051A
IO052B
57