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Thread: 503 Jetting

  1. #1
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    Default 503 Jetting

    Anybody got any suggestions for initial jetting on a 2 x Bing carb fan cooled 503 without gearbox so that I do not blow any engines up this year? Currently running manufactures recommended 158's

  2. #2
    Extremely active > 250 posts! Scrutineer
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    Ewan Black's Avatar
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    Default Re: 503 Jetting

    158 should be fine with fan cooling- 170 is usual for free air cooled.
    I'r Gad!

  3. #3
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    Default Re: 503 Jetting

    Yep, standard 158's all good

    Nick

  4. #4
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    Default Re: 503 Jetting

    Thanks for that, in one way it is re assuring. But it riases another question if the jetting was OK why did a rear piston melt in less than half a lap at Claydon.

  5. #5
    More than 30 posts! Club Member sweetm2369's Avatar
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    Exclamation Re: 503 Jetting

    Could be that an air leak leaned off the rear cylinder!
    Check carb manifold for splits and crank seals and gaskets.
    Hope that helps!
    Derek

  6. #6
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    Thumbs up Re: 503 Jetting

    Hi
    I would think it would need more running in , 503 need a lot of running in

  7. #7
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    Default Re: 503 Jetting

    Thanks I hope to get some hours on it this weekend.

  8. #8
    Very active > 100 posts Club Member
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    Default Re: 503 Jetting

    Google 503 run in, and you should find the Rotax run in procedure.

    Nick

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