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Asking if anyone has an idea what to look at. My engine is a 912ULS with 1550 hrs and immaculately maintained. Last week on the first start of the day the engine cranked about 1 revolution and suddenly stopped like the prop hit something. I had possibly let up on the starter early so didn’t get too concerned. Today again the first start of the day, OAT 65f, It happened again but this time I was holding the key on and saw the prop stop momentarily like it hit something then cranked through and started like normal. The engine cranks what seems like a good speed so I don’t suspect the battery. I am worried about damaging the sprague bearing. Ideas?

Walt

my blog; waltsrv12.com

  • Re: New starting issue

    by » 9 hours ago


    Hi Walt,

    Despite your comment "The engine cranks what seems like a good speed so I don’t suspect the battery." I would suspect that the battery performance had degraded.

    You can confirm this by;

    Making sure all connections (including negative) associated with the starting circuits (including relays/solenoid connections) are in good tight/clean condition.

    Charge the battery for at least 12 hrs, 24 better, using a quality multi stage charger.

    Leave another 24 hrs, after disconnecting charger -  start your engine - it should fire/start within 3 revolutions of the engine.

    If  battery lazy/weak -  replace!

    Persisting with a weak battery, will likly cost you many times the cost of a replacement battery, in a damaged starting system.

    😈


  • Re: New starting issue

    by » 9 hours ago


    Sean, this engine has never taken more than 2 revolutions to start, even now so that test is not going to tell me anything. Is there another way to load the battery? 


    Walt

    my blog; waltsrv12.com


  • Re: New starting issue

    by » 6 hours ago


    You can take the battery to a battery shop that can put a proper(Carbon Pile) load tester on it .

    You could also try a fresh battery, either in place of the one you have or using "jump" cables to see if you get faster/smoother cranking.

    Its a good sign that the engine starts in two revolutions however how fast is it cranking?

    Over many years I have found that once I start to doubt a batteries capacity, to hold & deliver a good charge, it's time for replacement. If the old battery still has some life, it can go in a mower or on an electric fence for the remainder of its useful life.😈

     


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