670 Summit TRA primary clutch ??

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670 Summit TRA primary clutch ??

  • Can someone help please.  What are the adjustments on the Rotax 670 clutch and what do they actually do?  I am refering to the 3 bolts with the line to numbers 1~6 and related to altitude.  Our clutch is engaging at 4200 but shifts out way to soon , like at 5500.  I feel the sled would run much better if both of these were raised.  Will these adjustments help either problem or do I need to change sprongs and weights.

    Thank for any info.

    Jeff

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  • I finally found it.  The "Clickers" or numer selection on the 3 levers of the Ski Doo TRA primary clutch are to adjust the upper rpm the engine is held at. This adjustment does not effect the engagment RPM.  For example.  If you are on number 2 and you are getting 7500  RPM at WOT moving the clicker to #3 will raise the RPM at WOT to 7700.  The next higher number is suppose to raise the top rpm of the motor 200 rpm above the previous lower number.   It is recommended that you start low like #1 or #2 and know your peak HP RPM and shoot for that or just under it.  Going past the peak rated RPM of your motor will only lessen performance so you dont want to over do it.  This adjustment is also intended for a tuning aid when going into higher altitude to keep the sled at the top of its HP / RPM curve.

    Hope this helps someone. It was hard for me to find.

    Jeff