Ignition Timing; Timing Procedure - Carbureted Engines; Timing Procedure - Cfi Engines - Polaris IQ 2007 Service Manual

IGNITION TIMING

Timing Procedure - Carbureted Engines

NOTE: Always verify timing of engine at room
temperature (68°F / 20°C), and at the specified RPM.
If applicable, make sure the key switch is in the
PREMIUM mode and the TPS is unplugged.
1. Reference the timing specification chart.
2. Install a dial indicator gauge into the MAG spark plug hole.
3. Place the MAG piston in the proper timing position, then
mark the flywheel at this point.
EXAMPLE: 600 HO Carbureted = 26° @ 3500RPM. Place
the MAG piston 4.0096mm (0.1579in.) BTDC.
NOTE: Each 10 degree mark is separated by lines
every 2 degrees (not shown). Acceptable timing
variance is +/- 2 degrees.
4. Connect an accurate tachometer and a good quality timing
light to the engine according to manufacturer's instructions.
5. Disconnect the throttle position sensor (TPS), if equipped.
6. Start engine and increase RPM to the point specified in the
timing specifications. Hold the throttle to maintain
specified timing RPM.
7. Point the timing light at the timing inspection hole.
8. With your head positioned so there is a straight line between
your eye, the stationary pointer and the crankshaft center
line, note the relative position between the marked flywheel
line and the pointer. If the stationary pointer is aligned with
the mark made in Step 3, or within the acceptable variance,
ignition timing is correct.
9. If the pointer is outside the variance, the stator will have to
be rotated either with crankshaft rotation (to retard the
timing) or against rotation to advance it.
NOTE: Rotate stator plate approximately the same
distance as the marks must move. In most cases, the
recoil starter housing, recoil drive hub, and flywheel
must be removed to loosen the stator bolts and
change the timing. On some engines, the stator plate
Battery and Electrical Systems
retaining screws can be accessed through the
flywheel.
10. Torque stator plate screws and flywheel nut to specified
torque. Apply Loctite 262 (red) to crankshaft flywheel taper
if required. Refer to the Specifications section for torque
specifications and flywheel installation procedure for
engine type.

Timing Procedure - CFI Engines

NOTE: Before performing procedure, verify there
are no current trouble codes and that all of the
engine electrical connections are clean and tight.
1. Reference the timing specification chart and locate the
piston BTDC measurement for 18°.
2. Install a dial indicator gauge into the MAG spark plug hole.
3. Place the MAG piston at 18° BTDC. Mark the flywheel.
NOTE: Each 10 degree mark is separated by lines
every 2 degree. Acceptable timing variance is +/- 2
degrees.
Flywheel
Rotation
4. Connect a good quality timing light to the engine according
to manufacturer's instructions.
5. Start and run the engine at idle speed until the engine
temperature is 120°F (49°C). Verify the throttle lever is
closed and the engine is at idle speed (1700 +/- 100 RPM).
NOTE: The
approximately 120°F (49°C) to obtain accurate timing
specification. Use the MFD digital temperature
display to view engine temperature.
6. Point the timing light at the timing inspection hole.
7. With your head positioned so there is a straight line between
your eye, the stationary pointer and the crankshaft center
line, note the relative position between the marked flywheel
line and the pointer. If the stationary pointer is aligned with
the mark made in Step 3, or within the acceptable variance,
ignition timing is correct.
NOTE: The stator plate, two-tooth, and five-tooth
crankshaft
adjustable.
8. If the pointer is outside the variance, either the flywheel key
has sheared allowing the flywheel to move on the
crankshaft, the crankshaft is out of index, a problem with
the engine electrical harness exists, or one of the crankshaft
position sensors has moved.
engine temperature
position sensor locations
must be
are not
11
11.5