Snowmobile Polaris 2006 - 2007 FS / FST. Manual - part 30

6.11

FS / FST Engine

6

Rev. 1 07/2006

Measure Rocker Arm Axial Play

• Out of specification: Replace rocker arm, rocker arm 

tower.

Measure Rocker Arm Axle O.D.

• Out of specification: Replace rocker arm axle.

Measure Rocker Arm Tower Bore I.D.

• Out of specification: Replace rocker arm tower.

Measure Crankshaft Deflection at Several Locations

• Out of specification: Replace crankshaft.

Measure Crankshaft Main Bearing Journal Diameters

• Out of specification: Replace crankshaft.

Measure Crankshaft Connecting Rod Journal Diameters

• Out of specification: Replace crankshaft.

6.12

FS / FST Engine

Rev. 1 07/2006

Measure Balance Shaft Deflection at Several Locations

• Out of specification: Replace balance shaft.

Measure Balance Shaft Bearing Diameters

• Out of specification: Replace balance shaft.

Measure Piston Diameter

• Out of specification: Replace piston.

Measure Piston Pin Boss I.D.

• Out of specification: Replace piston.

Measure Piston Pin O.D.

• Out of specification: Replace pin.

Measure Installed Ring End Gap

• Out of specification: Replace ring(s), measure cylinder 

bore.

6.13

FS / FST Engine

6

Rev. 1 07/2006

Measure Piston Ring Groove Clearance

• Out of specification: Replace ring(s) and/or pistons.

Chain Tensioner Operation

1.

Push tensioner into housing until flush with housing end.
Tensioner should lock into place.

2.

Six (6) audible “clicks” should be heard and felt as
tensioner is pushed into housing.

3.

Once locked, push tensioner inward. Tensioner should
activate and spring outwards.

• Replace tensioner assembly if clicking is not heard/felt, 

tensioner will not lock, or does not activate.

Inspect Chain Guides

• Replace wear pad/tensioner assembly if material is 

unevenly worn or guide is damaged.

Verify Starter Motor Clutch Operation

1.

Starter gear / clutch must move smoothly when rotated
clockwise.

2.

Starter gear / clutch cannot move when rotated counter-
clockwise.

• Replace assembly if clutch does not operate correctly or 

if rotation is rough.

3.

Inspect starter gear and timing rotor teeth for damage.
Replace assembly if damage is found.

EXTENDED

RETRACTED

6.14

FS / FST Engine

Rev. 1 07/2006

ASSEMBLY EXPLODED VIEWS

Valve Cover Assembly

IGNITION COILS

SPARK PLUGS

CAM PHASE SENSOR

VALVE COVER

COVER GASKETS

20 Ft.Lbs. (27 Nm)

6 Ft.Lbs (9 Nm)

6 Ft.Lbs (9 Nm)

6 Ft.Lbs (9 Nm)

APPLY ANTI-SIEZE