Valve Clearance - 335, 425, 500Cc Engines - Polaris Trail Blazer Service Manual

Valve Clearance - 335, 425, 500cc Engines

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.
CAUTION: Failure to position the crankshaft at TDC on
compression stroke will result in improper valve adjust-
ment.
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 up-
ward, directly in line with the crankshaft to camshaft center
line as shown. The camshaft lobes should be pointing
downward.
7. Verify accurate TDC positioning by observing the "T"
mark aligned with the pointer in the timing inspection
hole. In this position there should be clearance on all
valves.
Polaris Sales Inc.
Timing Plug
Sprocket alignment pin facing up
Crankshaft-to-Camshaft Centerline
2.
MAINTENANCE
Valve Clearance (4 Cycle)
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