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Adding a fuel primer

in 912 / 914 Technical Questions 9 years ago
Just a quick question inquiring if anyone has experience adding a primer to a 912 ULS? Mine is just way to stubborn to start in this cold WX. Seems to me a quick squirt of fuel is just what is needed. Once warm, she fires right up.

  • Re: Adding a fuel primer

    by » 9 years ago

    Personally I prefer the regular enricher (choke) over a primer setup, but you are right If you have neither you would be better off with one or the other. If you crank the engine to death in cold weather you may trash the battery, starter or sprague clutch. If the weather is really cold install an engine pre-heater. It will help save your engine.

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

      
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  • Re: Adding a fuel primer

    by » 9 years ago

    I took advantage of some down time and went though the linkage adjustments on the "choke" circuit. I think I have found the hard start issue as neither choke arm was pulling fully closed and one was significantly less than the other. Made some adjustments and test fired the engine cold (45 deg or so) and she started right up. I'm feeling better about the enrichner and cold starts now.
    Thanks Roger, your advice is always right on in this forum and you seem to answer questions tirelessly.
    Mike
      
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  • Re: Adding a fuel primer

    by » 9 years ago

    Hi Mike,

    Glad it worked out and back in business. Now it's time to go fly and have fun. :)

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

      
    Report

  • Re: Adding a fuel primer

    by » 9 years ago

    I added a primer to my 912. It would not start at 20f even at an idle too low for the gearbox. Just tee into the balance hose, I did the same with my hks, same carbs. I would get the idle down to a bare minimum for your prop first, it lets the added fuel do something, rather then get diluted with too much air. But at some point, you'll need a primer. It's easier on the starter, and easier on the box, as you can get up out of the shaking range instantly. Just barely crack the throttle, start cranking, and then start priming. it'll start on the third stroke and be merry at 3000rpm. In my old Champ we would prime before cranking, but why risk flooding if you have a starter? One caution, the oil pump is pulling cold thick oil thru a long hose. Watch the pressure and in just a couple of seconds the engine will be smooth enough to go down to min idle, even there the pressure will be 90 lbs. The pressure should arrive just as quickly as warm weather. I've never had to wait. If you are waiting longer for pressure, preheat.
      
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