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About nlappos

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  • Gender Male
  • Location Cedar City, UTAH
  • Interests flying, astronomy, reading, family

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nlappos's Activity

  1. nlappos added a post in a topic Air Screw   

    I used this video for the basic setup of my carbs, and found it really helpful.
    Allen , I am sure you know this, but for those who are looking to learn from these informative threads, here is the source material.
    The thickness of the needle controls the mid-range mixture, with numbers 272, 274, etc used to control mixture in this area, see
    Engine sputter or misfires (0 - 1/8 throttle)
    This area is controlled by the low speed or idle jet, and air mixture screw. Check to make sure the jet is clean and the proper size. Check to see the air mixture screw is set correctly.

    Engine sputter or misfires (1/8 - 1/2 throttle)
    This generally indicates a lean fuel mixture. Check to make sure your needle and clip are in the right position and are not damaged. The air screw still has some effect here.

    Engine sputter or misfires (1/2 - 3/4 throttle)
    This area is controlled by the needle jet and jet needle. Verify that you have the correct jet and needle jet. Also verify that they are located BELOW the white plastic retaining cup. If they are located on top of the retainer the engine will run rough in all ranges, since the mixture is wrong in all locations.
    The mid range is controlled by the needle and needle jet. The needle jets are available in various sizes with the larger numbers giving a richer fuel mixture and the lower numbers a leaner mixture.
    Here are the various jet needles:

    A reported problem with ALL Bing carbs is with failure of the jet and or needle clip. This can result in erratic running, lean fuel mixtures, engine returning to and idle during flight.
    To determine whether you need to adjust the needle jets you require a EGT gauge and tachometer.
    For example:
    Many owners of 582's have reported high EGT readings in the 5600 to 5800 rpm range using the stock needle jet of 272 - using a 274 or 276 eliminates this problem.
    Owners of older model 532 report having a problem keeping the engine set at 5400 rpm. It would jump up and down from 5400 to 5800 resulting from  a lean fuel mixture. Again the larger jet usually cures this problem.

    Engine sputter or misfires (3/4 to full throttle)
    This area is controlled by the main jet. Check to make sure it is in place and snug. Make sure there is no water in the bottom of the float bowl. Make sure the needle and clip are in good working condition. If the needle fails around the clip retaining area this will allow the needle to jump up and down causing erratic running. Proper float level is also important here to little fuel flow can cause an lean mixture while to must flow can result in a rich mixture.
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  2. nlappos added a post in a topic Landing gear drawings   

    Lowell Fitt has a nice design that he sells as a kit, I put it on and love them. I can get you his email if you pm me.

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  3. nlappos added a post in a topic Facebook Avid Site   

    I understand the Federal Court agrees! ;-)
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  4. nlappos added a post in a topic New guy with a KF2 in England   

    Welcome, skelly! Judging from your background, you'll fit right in around here! 
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  5. nlappos added a post in a topic Anyone have an avid around Denver and can I sit in yours?   

    Good idea, I am 5'11' and 260, and I think I am close to max. If i put a 1' pad on the seat, my headset rubs the upper window.
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  6. nlappos added a post in a topic 670 info   

    I have a rotax rick 670, and used Mike Hair to make the right exhaust for my Avid. The Kitfox is upside down relative to the Avid, right? Can't imagine the KF exhaust working.
    I used Mike to reweld the 582 exhaust, and it was quite cheap. Might want to give him a call. 801-eight two nine 5877
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  7. nlappos added a post in a topic best numbers for a 582   

    The coolant water temperature is quite important. The internal temp of the pistons and the cylinders must be balanced, so that the growth of the piston diameter with its internal heat is matched by the growth of the cylinders so the piston does not scuff the cylinder walls. If the temp is cold, and full throttle is applied, the pistons can scuff badly (sometimes enough to weld and stop the engine).
    Note on page 2-2 the minimum water temp is shown as 150 deg f, for this reason.
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  8. nlappos added a post in a topic best numbers for a 582   

    For the versions of the 582, max egt is 1200, and about 1150 is a nice operating max for some margin. I think you could richen up a bit, so you get peak egt closer to peak rpm of 6500.
    I got a boat fuel flow gauge in my fuel line, and it makes it easy to see what you are doing, as well. They're not cheap, maybe $500 total. Also the Hacman (or the home made versions the folks have posted) works very well to control egt and fuel flow.
    Rotax 582 Operator Manual:
    OM_582 UL Series_Ed3_R0.pdf
    Some threads on Hacman clones: 
    Hacman web site:
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  9. nlappos added a post in a topic New forum category! A place to introduce yourself. Please Post!!   

    Congratulations, and welcome! I really agree with ChrisBolkan, buy one now (used Avids can be had for about 12 to 15 k), and fly it while you build your own. Also, consider a kit, which will carve years off your build process, especially all the grunch work. Avid kits are out there, as are partial builds.
    But in any case, welcome!
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  10. nlappos added a post in a topic Whelen green lens needed   

    I went thru the same search and ended up paying the $35 to Aircraft Spruce. At least the lens was a nice quality glass one.
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  11. nlappos added a post in a topic Rotax 582 power loss diagnosis   

    Can I strongly suggest the electric backup pump mentioned above? You can switch it on for landing and takeoff, put it off in cruise except when things get too quiet, when it can get you started again.
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  12. nlappos added a post in a topic Avid flyer flight characteristics   

    My biggest tip is "Happy Feet". As you flare on touchdown get your feet pumping about 1/4" so they are not planted, and they can respond instantly to any yaw control needs. Made a big difference in my landing roll outs.
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  13. nlappos added a post in a topic Original Wheels   

    I found sacrificing a few inner tubes by pinching them with the wheel halves made it all work.
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  14. nlappos added a post in a topic Crazy or what?   

    This is a 4 lb package sent 450 miles from one podunk town to another, shows half the UPS Ground cost that Wag Aero charged!!

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  15. nlappos added a post in a topic Stopped project   

    Allen, that is so tragic. My sincere condolences to you and your wife. Our little community here is a tight one, we all have families and we share a love of flying, we feel so much for you. Nick Lappos
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