Polaris 2007 Sportsman 450 EFI, Service Manual

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2.25
MAINTENANCE
2
23. Re-check the oil level on the dipstick and add oil as
necessary to bring the level to the upper mark on the
dipstick.
24. Dispose of used filter and oil properly.
Oil Pump Priming Procedure
NOTE: This priming procedure must be performed
whenever the oil hose connection between the oil
tank and pump inlet has been disconnected.
1. Clamp or pinch off vent line (A) approximately 2” from oil
tank to avoid the end of oil tank vent fitting, and the vent
line’s pressure relief slit
2. Run engine at IDLE for 10-20 seconds.
3. Remove the vent line clamp. The oil pump will now be
properly primed and ready for field operation.
Note: If the
system is primed properly you should hear some air
release. If you do not, the system has not primed. Repeat
the process if necessary.
Valve Clearance
Inspect and adjust valve clearance while the engine is cold and
the piston positioned at Top Dead Center (TDC) on compression
stroke.
1. Remove the seat.
2. Remove body panels and fuel tank as necessary to gain
access to valve cover.
3. Remove the spark plug high tension lead and remove the
spark plug.
CAUTION: Place a clean shop towel into the
spark plug cavity to prevent dirt from entering.
4. Remove rocker cover bolts, cover and gasket.
NOTE: It may be necessary to tap cover lightly with a
soft-faced hammer to loosen it from the cylinder head.
5. Remove timing inspection plug from recoil housing.
6. Rotate engine slowly with recoil rope, watching the intake
valve(s) open and close.
NOTE: At this point watch the camshaft sprocket
locating pin and slowly rotate engine until locating pin is
facing upward, directly in line with the crankshaft to
camshaft center line as shown. The camshaft lobes
should be pointing downward.
Slit
(A)
( A) Vent Hose to Air Box
Oil Lines
To Engine
CAUTION
Failure to position the crankshaft at TDC on
compression stroke will result in improper valve
adjustment.
Sprocket alignment pin facing up
Crankshaft-to-Camshaft Centerline