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Hi I have a 914 on a Zenith, the high spring tension of the carbs is causing the Zenith dual throttle bell-crank to bend. 

I see McFarlane and Vans sell a lighter spring, but there are scattered reports of brakeage. 

It appears the Vans use a solid wire push throttle that can operate without springs at all. If a pull only wire was used that could be bad.

Wondering if anyone has any thoughts on this or used a lighter spring?

  • Re: Lighter Throttle Springs

    by » 2 weeks ago


    I've been using the McFarlane springs for just over a year and they are better than the stock springs when it comes to throttle creep. They exert less force than the originals without being too weak. As with either spring type, you need to make sure that the plastic grommets are fitted and in good condition otherwise the springs will wear through the metal brackets.


  • Re: Lighter Throttle Springs

    by » 2 weeks ago


    If you’re having throttle cream either tighten your throttle friction or you can use the red & blue McFarlane springs. They work just fine and shouldn’t break. The other thing you can do is upgrade your throttle.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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