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    • May 23, 2016 at 10:13 am #66314
      Jon Clem
      Participant

      Thanks for all the help here!  I installed the crank position sensor gasket, that was an instant fix!  My engine guy made one because Rotax was out of them…….imagine that!  I put in a 125 jet and that thing had too much power for me. It was a handful!  I love it…..now to get the chassis setup right!

       

    • May 9, 2016 at 8:56 am #65588
      Jon Clem
      Participant

      It actually wouldn’t reach the same RPMs. Started stumbling at 9,000 or so. I forgot to mention that I also went up to a jet of 140 during the race.  I will be suggesting to my engine guy that I drop it off and let him dyno it.  I am getting tired of the issues.

      I will have him put in a second gasket while on site.  I want him to see what is going on before he tries anything.

      Thanks,

      Jon

    • May 8, 2016 at 6:13 pm #65555
      Jon Clem
      Participant

      I also need help.  Pre-EVO upgrade, no issues.  Ran all season, same jet happy. Fresh rebuild by respected and talented Rotax dealer.

      After upgrade, won’t run past 10,500 or so.  Stumbles down long straights, power out the ass from 6,500 to 9,500.  He was convinced it was jetting.  Jets tried were 130, 132, 127, 125, 122, 118.  Nothing worked, no low end with 118.  Swapped carbs with the good original.  Same thing.  Stumbles at 10-10500.  Tried a buddies brand new ignition, coil pack, removed the pill.  Power valve is definitely opening at 7500.

      Now what?

      I miss my old engine.  I ran two new series with the EVO upgrade…..MASS and Championship Enduro Series.  The straightaway at Gateway sure gives you a long time to think about the “upgrade”.   Everything is grounded, mounted with the new wiring harness upgrade version.

      Everyone that ran Rotax this weekend had the kits still in the box…..

      Thanks,

      Jon

    • May 10, 2016 at 5:40 pm #65671
      Jon Clem
      Participant

      I had the same symptom happen with and without the pill.  Thanks for the heads up…….I will get some gaskets on order pronto!

      Jon

    • May 8, 2016 at 7:23 pm #65558
      Jon Clem
      Participant

      It actually wouldn’t reach the same RPMs.  Started stumbling at 9,000 or so.  I forgot to mention that I also went up to a jet of 140 during the race.  Lower power, lower RPMs.  I am SURE it was really rich.  My buddy has the same setup, and he was running a 125 or so……

      Nobody near me has had any issues.  Guys at the track said gearing or jetting.  I keep preaching to them that I don’t think it is carb/gearing related since the carb swap has the same exact symptom.

      I will as also told that the vacuum lines layout, and length are critical.  I haven’t had chance to look at that yet.

      It am assuming that the crank position sensor is the same one as last year…..

       

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