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  1. T

    Bing 54 carb float weight spec's

    Carbs are relatively new, only 10 hours on the engine and carbs.
  2. T

    Bing 54 carb float weight spec's

    Not sure that this is the proper forum, All literature on rehab, cleaning , etc. say that both floats should be the same weight. However, its not stated what the tolerance is on the weights. Weights on the floats on my Bing 54 are 2,3,4,5 grams. I suspect that they should be paired 2,3...
  3. T

    503 DCDI engine failure.

    Didn't check the switches for AC voltage rating. Big Mistake!!!!! Engine runs just fine when kill switches are removed.
  4. T

    503 DCDI engine failure.

    Problem solved, and the answer was out there all the time. After the first stoppage, the kill switch wires were checked and replaced but not the switches. The engine was run at takeoff power for 5 minutes with the kill switches and assoc. wiring disconnected with out failure. Never though...
  5. T

    503 DCDI engine failure.

    Interestingly, A forum suggestion solved the problem. The suggestion was to disconnect the external engine wires from the CDI's that connect to the remote kill switches. completely isolate the engine sides of the wires, then start and run the engine. After warm up, the rpm's were increased...
  6. T

    503 DCDI engine failure.

    Update on action taken. Removed front carb, removed internals and cleaned with carb cleaner. all parts ok, bowl fill needle seat good, float arm level and operable. re-installed carb and ran engine. it started but idled same as before but no overflow squirts from vents. checked bowls, and...
  7. T

    503 DCDI engine failure.

    Yes, After installing the elec fuel pump, had fuel squirt thru vent. Possible flooding. Carb inspection and cleaning pending.l Floats appear ok in the bowl, but will be weighed. Thanks
  8. T

    503 DCDI engine failure.

    on 1. two shutdowns, each on different plugs. 2nd time on new ones 2. - 4. done 5. not done. inspected and no corrosion 6 - 7 Stator charging winding checked out ok. Thanks
  9. T

    503 DCDI engine failure.

    Iagree on the CDI's. The engine stopped abruptly like the kill switches were activated. Didn't runon one cdi/cylinder, drop rpm or anything. No indication of heat, the engine id not cowled. Have not checked the fan belt, but at 60 mph, it should have had enough cooloing even without the fan...
  10. T

    503 DCDI engine failure.

    Thanks for your post RV7Charlie. Yes, The ROTAX 503 when properly tuned and setup is a fine machine. But when something goes wrong, it can be a nightmare, requiring more expertize then is in my tol chest. I did seek the assistance of a specialist who has made numerous inputs, however...
  11. T

    503 DCDI engine failure.

    Know that as I think about it, after the high rpm stoppage, and after a little cooloing, as I mentioned on another post, I managed to get it started. I idled very rough as on one cylinder. The tiny tack is tied to only one spark plug wire, and instead of reading normal 2200 rpm idle, it was...
  12. T

    503 DCDI engine failure.

    Continuing, What's the chance that bolts have loosened on the engine with the heat cycling? You say air leaks. Perhaps a go through, retorquing all bolts may be a worth while endeavor. Thanks
  13. T

    503 DCDI engine failure.

    Plugs are new, put in just before the test run so they didn't have but a few minutes on them. Engine is achieving full rpm of 6500, but EGTs are not getting up to rated. 1000 deg on one cyl and 890 on the other. General agreement is it running rich. Ultra prop is a three blade, with 12 deg...
  14. T

    503 DCDI engine failure.

    Thanks for the response. The system is giving me fits! I'm yet to gain access to the potted CDI pods to go through a full resistance check against the Rotax recommended values. Found a CPI replacement module for $99 on Ebay. Engine mount is in the way of the two modules on an upside down...
  15. T

    503 DCDI engine failure.

    Thanks for the response. The switches and wiring were the first things I suspected. Both check out ok, unless the switches are breaking down internally.
  16. T

    503 DCDI engine failure.

    Need some help troubleshooting and diagnosing why my engine stops dead. Posted same subject some time ago of engine stopping on maiden flight/ solo flight in a High Max with the 503. Have gone through much back and forth as to things to check, things not to do, etc. Having determined that...
  17. T

    HELP me get my Quicksilver MX II running please!

    No I didn't. My Bad!!! But You have good insite into things ROTAX, judging by past posts. If I can get some good info from you, its not allo bad, Ay!
  18. T

    HELP me get my Quicksilver MX II running please!

    The mentiioned gap setting of 0.19" for a single carb is new to me. My 503 is DCDI, dual Bing 54's. Can't find a recommendation of plug gap in the ROTAX manual. If you can point me to a setting in the doc's, or recommend one it would be appreciated. Plugs are NGK BR8EIX. On the same...
  19. T

    EAA spreadsheet for landing gear design

    My Hi-Max weighs 320 lbs with a ROTAX 503DCDI, The original wood landing gear is reversed, with a stearable nose wheel of Aluminum. Also has wheel brakes on mains. Nose wheel design is patterned partly on Team MiniMax, modified for my plane. Engine is inverted and mounted on aluminum...
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