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  1. SBT engines are de-tuned; Why would anyone want that?

    All the watercraft manufactures build their watercraft to withstand customer abuse.

    Every year manufactures send riders out to ride their new watercraft nearly every day to
    discover problems that may occur to a customer. Their constant testing allows them to
    gain many more hours on the skis before the customer.Then manufactures send out service
    bulletins, in advance of the problems occurring to the customer. Well run service departments
    will fix those problems ...
  2. Jetting instructions for dual 38mm BN carbs mounted on a reed valve engine.

    Note: These instructions have been modified for bn 38mm round body carbs on a reed engine.
    It assumes you have the correct impeller for your particular set-up. Read the entire thread if you
    do not understand

    Idle drop test
    (1) Perform the idle drop test on a trailer. Set the low screw set to a rich setting. For example:
    1 ½ turns out, and warm up the engine (Sam you may need a leaner initial setting between 1
    and 1 1/4 turns ...

    Updated 08-15-2014 at 06:29 AM by wmazz

  3. Jetting Basics, Part 1

    The article will be based on the assumption the watercraft is in good running condition before changes
    are made. The simplest method is rejetting an oem set of carbs with the intention to correct a problem
    or to increase acceleration. The worst mistake is to perform changes to your jetting or attempt "reverse
    jetting" as part of a rebuild, or in conjunction with other pump, and, or engine modifications without first
    developing a functional baseline to work from.

    Updated 11-19-2020 at 02:40 AM by wmazz

  4. Jetting Basics, Part 3

    Evaluate your fuel screw settings
    After you have found your initial settings, it is time to reevaluate the success of your jetting. I normally strive to achieve a ¾, ¾ turns out on my pilot and hi-speed screws. In order to estimate changes in my jetting, I use as a rule of thumb “¼ turn equals a jet size.”

    I recommend you make it a habit to strive for pair settings of (¾, 3/4), (1, 1), (1 ¼, 1 ¼). The main reason for this is to be able to recognize a problem when it exists. ...

    Updated 11-19-2020 at 04:30 PM by wmazz

  5. Jetting Basics, Part 2

    Jetting Basics
    First off, jetting isn’t always increasing a main jet, arbitrarily changing the needle seat diameter, or
    modifying pop-off psi to somebody’s standard. Jetting is all about creating or maintaining a balance.
    This balance applies to any type of carburetor, and always begins with the pilot circuit. The pilot circuit
    is flowing fuel 100% of the time, and the low speed circuit creates a balance between the pilot screw
    setting, low ...

    Updated 07-23-2014 at 11:24 PM by wmazz

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