Intake Valve Clearance Adjustment; Exhaust Valve Clearance Adjustment; Steering - Polaris A12MH46AX Service Manual

MAINTENANCE
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.

Intake Valve Clearance Adjustment

1. Insert a .006" (.15mm) feeler gauge between end of
intake valve stem and clearance adjuster screw.
2. Using a 10 mm wrench and a screwdriver, loosen
adjuster lock nut and turn adjusting screw until there
is a slight drag on the feeler gauge.
3. Hold adjuster screw and tighten adjuster lock nut
securely.
4. Re-check the valve clearance.
5. Repeat adjustment procedure if necessary until
clearance is correct with locknut secured.
6. Repeat this step for the other intake valve.
INTAKE VALVE CLEARANCE
.006" (.15 mm)

Exhaust Valve Clearance Adjustment

Feeler gauge for both valves
NOTE: The exhaust valves share a common rocker
arm, and must be adjusted using two feeler gauges.
2.24
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
1. Insert a .006" (.15mm) feeler gauge between end of
both exhaust valve stem and adjuster screw(s).
2. Loosen locknut(s) and turn adjuster screw(s) until
there is a slight drag on feeler gauge(s). The Valve/
Clutch Adjuster Tool (PA-44689) can be used to adjust
the engines valves.
NOTE: Both feeler gauges should remain inserted
during adjustment of each valve.
EXHAUST VALVE CLEARANCE
.006" (.15 mm)
3. When clearance is correct, hold adjuster screws and
tighten locknuts securely.
4. Re-check the valve clearance.
5. Repeat adjustment procedure if necessary until
clearance is correct with locknut secured.

Steering

The steering components should be checked periodically
for loose fasteners, worn tie rod ends, and damage. Also
check to make sure all cotter pins are in place. If cotter pins
are removed, they must not be re-used. Always use new
cotter pins.
Replace any worn or damaged steering components.
Steering should move freely through entire range of travel
without binding. Check routing of all cables, hoses, and
wiring to be sure the steering mechanism is not restricted
or limited. 

NOTE: Whenever steering components are replaced,
check front end alignment. Use only genuine Polaris parts.
WARNING
Due to the critical nature of the procedures outlined in
this chapter, Polaris recommends steering component
repair and adjustment be performed by an authorized
MSD-certified technician when replacing worn or
damaged steering parts.
Use only genuine Polaris replacement parts.