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Jumbo jet

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  1. B, please take my advice, I work on these 912 engines, plug fouling on Mogas is rare if u have a healthy engine so u have a problem, either u have a tired old engine and it’s burning oil or its over rich which can be caused by a too rich idle mixture setting, worn jet and jet needle or just tired old carbs, carbs should be overhauled at the 5 yearly rubber replacement or no later than 1000 hours, now when I say overhauled this is a complete strip down and all parts cleaned in an ultrasonic cleaner and needle jet, jet, circlip and o ring replaced and check that the mixture enriching device ( choke ) is returning to off and the tiny dot on the choke shaft is pointing towards the cable. Set idle mixture screw to 1.5 turns out and have main needle jet circlip on second from the bottom groove.

     

    If u believe you have a good engine, first buy a set of plugs from Bert Floods, DONT SKIMP HERE as they properly gapped and have the proper heat paste applied, set the idle mixture at 1.75 turns out, don’t excessively slow idle the engine on warm up and give that a try, if it still cacks up plugs the problem might be as mentioned above, this is a starting point for u..

     

    Good Luck.

     

     

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