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  1. #1

    1050 Static Timing

    I've searched the forum and can't seem to find an answer to my question...

    I have a '97 SLTX with the 1050 engine that burned up the MAG piston. One of the things I'm checking is the static timing, and I want to make sure I'm doing it correctly.

    I built the LED timing tool (as suggested here) and I'm using the Clymer Shop Manual.

    If i'm reading the manual correctly, the LED should light when my MAG cylinder piston is between .24 and .26 inches BTDC. Does that sound right?

    In my case, the LED illuminates at ~.22 inches BTDC, which correlates to ~ 30 degrees BTDC on the flywheel. Does that sound right, or at least acceptable?

    Thanks, Kevin


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Static timing

    Static Timing Light tool (PN 2871745) can used to check ignition timing on Polaris engines equipped with hall effect sensors.

    Be sure to set the timing to the "Static Timing Reference Location" shown in Static Timing Table when using
    the Static Timing Light.

    9. Make sure there is a good 9v battery in the tool.

    10. Open electrical box, disconnect brown stator lead and connect it to brown lead of tester.

    11. Disconnect black stator lead and connect it to black lead of tester.

    12. Connect white wire to Red (Magneto cylinder-#1) stator wire.
    NOTE: The white wire on the tool is the sensor wire and must be connected to the Mag cylinder Hall-Effect sensor wire.
    Red = Mag (#1) cylinder.

    13. Remove spark plugs and install dial indicator (with extension) in the Magneto (1) cylinder.
    Find Top Dead Center (TDC).

    14. Rotate crankshaft counterclockwise (as viewed from front) until light comes on. Continue rotating in same direction until light goes off. Rotate an additional 1/8 turn or so, then reverse rotation direction (turn clockwise).
    Read the dial indicator at the instant the light comes on.

    15. Static timing is correct if the dial indicator reads within the static timing reference limits listed in the table below.
    The CDI box uses this reference location to determine when to fire the ignition.

    16. If timing is out of specification, refer to adjustment procedure above.

    17. This tool can also be used to test Hall Effect sensors. Simply connect the white test wire to the Blue (Cen) or Green (PTO) wire from the stator.

    The light should come on and go out sharply (as indicated in static timing) if the sensor is functioning properly. If the light glows or is slow to react, the Hall Effect sensor is damaged.

    All 900's & 1050's 18 ±2°

    (Spark occurs)
    Piston Location BTDC .0815" (2.071 mm)

    (Static Timing Reference Location)
    Piston Location BTDC .240"-.260" (6.09-6.60mm)

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Arrow 700,900,1050 Engines - 136mm Rod, 68mm Stroke: Degrees to Piston Position Conversion

    Degrees BTDC - Inches/MM
    10 .025/.64
    11 .031/.78
    12 .037/.93
    13 .043/1.09
    14 .050/1.26
    15 .057/1.45
    16 .065/1.65
    17 .073/1.85
    18 .081/2.06
    19 .090/2.29
    20 .100/2.55
    21 .110/2.81
    22 .121/3.07
    23 .132/3.35
    24 .144/3.64
    25 .155/3.95
    26 .168/4.26
    27 .181/4.58
    28 .194/4.92

  4. #4
    Thank you K447.

  5. #5
    I know this thread is SUPER DUPER old, but I am working on setting timing for a ski and need some help. Is it absolutely necessary to use a dial indicator to set the timing through the static method? Are there any other routes?

  6. #6
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    The dial indicator is the most precise way to do it. I bought a dial indicator that screws into the spark plug hole on ebay for around 50 bucks.

  7. #7
    Rasta Mon Condoms We Be Jammin!!!!! TxVirageTx's Avatar
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    the hall effect sensor triggers way before the 18 degrees,the cdi unit retards the timing from there.you always have to go back past the trigger point and then rotate into the direction the crank turns during running to get it accurate.goin back and forth across the trigger point won't do it

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