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Thread: Rotax 503 piston damage

  1. #1
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    Default Rotax 503 piston damage

    Hi all

    A bit of piston damage form a 503 which I think is from a bit of the upper ring letting go. Theres no burning so I dont think its lean mixture and the plug is OK. Looks like a bit of the ring snapped and then bounced its way around the cylinder...not pretty.

    But of course the question is why did the ring break.....any thoughts

    Pat
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  2. #2
    Forum God > 400 posts Club Member Winst's Avatar
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    Default Re: Rotax 503 piston damage

    Is it back or front piston?
    Air or forced cooled?

  3. #3
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    Default Re: Rotax 503 piston damage

    Ive done a couple now similar to that over the years - they just go.....
    Usually with age/lack of replacement.

  4. #4
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    Default Re: Rotax 503 piston damage

    Wayne

    Its the front piston (Mag side) and its free air cooled. Its been in there a while....dont really know how long. Also the tang on the spark plug was bent so it shorted against the tip.

    cheers

    Pat

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