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Permalink Reply by Dave Geiling on October 22, 2020 at 6:53am

Scott,

I don't really have any recommendation for you.  I purchased a previously built 601 that employed a vernier mixture control.  The vernier part might be ok, but the need to press a release button to make a large movement of the throttle wasn't.  I used a friction lock cable from AS, simple and similar to what was used in my previous a/c.  Some of the posters here have touted a new McFarland vernier throttle setup, check John Austin's posts. 

The most significant info I can pass on is to purchase the throttle lever extension detail from Arion Aircraft, 931-680-1781, it increases the stroke length from idle to full throttle allowing a more finite adjustment of the throttle.  Hope this helps. Dave

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Permalink Reply by John Austin on October 22, 2020 at 7:15am

As I recall, a simple friction throttle was included when I purchased my FWF kit from Jabiru USA (dealer prior to Arion) several years ago and it worked great!

However - and admittedly it's expensive - but if you want the very best, I highly recommend the McFarlane "Vernier Assist" throttle control.  It is a conventional push-pull throttle with adjustable friction, but when you tighten the friction ring, you can make fine adjustments of the throttle by twisting the knob vernier-style.  There is no locking ring or button to have to engage to do this and it is claimed to be absolutely jam-proof.  It is available in a number of lengths and can be terminated with a wire cable (likely what you want for the Bing on the Jab) or various threaded rod ends.  I have a post that mentions it here and a blog here.  Disregard all the info about the reversing bellcrank - you don't need that with the Bing carb.  (I switched to an AeroInjector to gain a mixture control and it requires a reversing bellcrank.)  BTW, you can purchase it directly from McFarlane - they'll configure it exactly how you want it and give you a 5% (I think!) discount for membership to any of the alphabets - EAA, AOPA, etc.  Actually, I think they give the discount to anyone - they don't ask for membership numbers/proof, etc.

The throttle extension lever for the Bing that Dave mentions was included with the FWF kit I received from Jabiru USA.  One note of caution:  The additional length of the arm will certainly increase the throttle stroke which allows for easier/finer throttle adjustment, BUT, it also increases the leverage!  The throttle stop on the Bing is relatively flexible - what happens is you can adjust the idle speed perfectly on the Bing, but in-flight, if you pull the throttle too vigorously, the increased leverage can actually flex the throttle stop further back and kill the engine!  Don't ask me how I know! Ha!

I complained about this to Pete at Jabiru USA and he gave me a set-screw collar to put on the throttle cable to act as a secondary stop.  The collar will contact the cable's outer sheath and stop it from being pulled back too far.  However, I must admit I never installed it when I had the Bing carb since I learned to just lightly pull the throttle back and never had another problem.  It probably should be installed, though, in case someone unaware of the problem was flying and was a little ham-handed on "yanking the throttle!"

John

N750A

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Permalink Reply by Scott Matthews on October 22, 2020 at 8:23pm

Thanks Gents some good ideas. For info I'm in Australia.

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Permalink Reply by John Burns on October 24, 2020 at 9:41am

Here is the single throttle currently shipped with the Jabiru FWF kit.  It is a budget version for non certified, but a full friction lock good quality throttle cable.  We will see how it is when I finally get it flying.  I may add the throttle stop that John Austin mentioned.  My biggest delay was actually getting the firewall pass thru from Spruce.  Apparently they were on back order.

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Permalink Reply by Scott Matthews on October 25, 2020 at 7:39pm

Fantastic, takes the guess work out appreciated.

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Permalink Reply by Thomas Norris on November 14, 2020 at 5:19pm

Scott:  I have a 4th gen Jabiru 3300 and I was not happy with the pushrod throttle system that came with the FWF package.  Following John Austin's advice, see below, I put in a McFarlane Vernier Assist throttle on the left side and a McFarlane Friction Lock throttle on the right.  Works great, and I have been very happy with it.  Tom

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