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Carbs pushrod linkage

in General Tech Discussion 12 years ago
I synchronize my carbs with a carbmate about every 50 hours. The 912 F series is an older engine and runs smoothly when synched. But, within a very short period, I notice the engine isn't smooth anymore. The throttle linkage is brand new, the carbs are brand new, it just doesn't stay put.
I am devising a pushrod linkage with my mechanic to replace the bowden cables. I think the pushrod linkage with threaded rod ends and turnbuckles will fix the problem. any comments?

  • Re: Carbs pushrod linkage

    by » 12 years ago

    Jay,

    Any sharp bends in the bowden cables can cause this. Also lack of lubrication in the cable sheath and the splitter. Sometimes a weak return spring on the carb end of the cable can be a problem. Pushrods will definitely work if you can work out the pathway for the rods. Another solution is to use the solid wire type cables. No return springs necessary with the solid pushpull wire.

    Bill.
    Thank you said by: jay white
      
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  • Re: Carbs pushrod linkage

    by » 12 years ago

    I'll be watching the forum for your results. Good Luck.
    616Jim
      
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  • Re: Carbs pushrod linkage

    by » 11 years ago

    I have abandoned the push rod mod, it's not cost effective to put bastard items in your plane when you are the only maintainer. The mod was becoming more trouble than it was worth.
      
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  • Re: Carbs pushrod linkage

    by » 11 years ago

    Hi Jay,
    we have installed the McFarlane throttle cables and are very impressed. They have a Rotax version with a splitter built in and nice hardware.
    I know the Kitfox IV is very challenging with the outboard carbs and very short throttle cables so some experimenting with cable routing will be required. Try ordering extra long cables and criss-crossing them so the engine shake is absorbed? You can then trim the cables to length. (the stock cables are horrible; when the engine shakes in the mounts the throttles are pulled!) Note: This design pre-dates the current Kitfox company who have an excellent installation.
    http://www.mcfarlane-aviation.com/Products/?CategoryID=251&ID=18082079&Make=Rotax&Model=912F3&
    Rob
    Thank you said by: jay white
      
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