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Jet Boaters Community Forum

    #rotax
    New Chapparal 242VRX steering pulling, Jul 15, 2017
  1. BobJohnson

    I have not had this issue. Hopefully someone else might know more. Best I can do is refresh this post.. Hope you can get this fixed yourself

    #rotax
  2. reverse gate question, Jun 10, 2017
  3. BobJohnson

    I should know this, but guess I don't. Question is about my Rotax / Chaparral system, but I imagine it does not differ with Yamaha

    When going at low RPM (under 1800 -2000, or for my boat, under 4 mph) is the reverse gate fully open and clear of the jet nozzle? Or, does the gate cover a portion of the nozzle until higher RPM's?

    Reason I ask is I have a slight rattle sound that comes from that area when I am under 2000 RPM. As soon as I go over that mark, the sound clears up. It is not consistent either. I've tried recording it, and it doesn't come over well on my phone. My thought is that something is loose on the buckets and at that low speed, if the buckets are partially down over the jet nozzle, that is the cause of the rumble/vibration I hear.

    #rotax
  4. Rotax Engine Forum now available!, Oct 28, 2016
  5. Julian

    So after way to much time discussing and pondering this idea, we now have a Rotax Engine Forum!

    Feel free to post your Rotax engine topics here!

    #rotax
  6. Vortex Break In, Jun 19, 2016
  7. BobJohnson

    Stay on top of Munson. They do good work, but for me at least I get the feeling they need pushing. Your testing with ski mode sure makes it sound like a throddle issue. @ScarabMike please read the op. Any thoughts? #rotax.
  8. Things to know about break-in period?, Jun 7, 2016
  9. BobJohnson

    run through all the options you have and make sure things work and work again. You want to know of any issues before you take it in for its check up.
    The Scarabs have the same engines ( #Rotax ) as the Chaparrals, so look back in some of the old posts in both the Scarab and Chaparral sections of this site, to see what others asked and learned along the way. Mostly enjoy.
  10. Cut out and then One beep, May 29, 2016
  11. BobJohnson

    Glad/hope this fixes your boat.

    @ScarabMike excellent job. Man, you know your stuff and it's a pleasure to read and learn as much as I can about our engines from you. #rotax (my first ever hastag )