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Rotax 503 Manufacture Date

  • Leslie R. Thomas
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8 months 4 weeks ago #15371 by Leslie R. Thomas
Leslie R. Thomas created the topic: Rotax 503 Manufacture Date
I am looking at buying a used 503; current owner says that it has 80 hours on it, but I am looking for the manufacturer date.

The serial number is M5766941.

Can anyone assist?

TIA

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8 months 4 weeks ago #15375 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Rotax 503 Manufacturer Date
5766941 is a ROTAX 503 UL FAN produced February 13th, 2004

original factory configuration:
with rewind starter and
starter rope standard
UL-reduction gear box B 2,58
NM - not assembled
with 2 Bing-Carburetors 887823
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8 months 3 weeks ago #15383 by Herb Gayheart
Herb Gayheart replied the topic: 503 Manufacture date
I own the 503 mentioned in a previous post...sn 5766941.. also have two others ..one is "run out" and was replaced by above sn engine....its sn is 4839311 supposed 280 to 320 hours..
also have another supposed "low time" 503...sn 4158056.. would like the manufacturing dates and particulars for these two engines....thanks Herb

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8 months 3 weeks ago #15397 by RotaxOwner Admin
RotaxOwner Admin replied the topic: 503 Manufacture date
4839311 is a ROTAX 503 UL FAN produced 25-May-1998 (no other info is available).

4158056 is a ROTAX 503 UL FAN produced 21-Jun-1993 (no other info is available).

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8 months 3 weeks ago #15398 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Rotax 503 Manufacture Date
If the previous owner of the engine did not supply a properly filled out log-book, then you are basically holding an 'unknown quantity', and at very least you should assume that all the rubber must be replaced... probably be a good idea to keep an eye on the seals as well, if it has been stored for any length of time...
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8 months 2 weeks ago #15458 by Herb Gayheart
Herb Gayheart replied the topic: Rotax 503 Manufacture Date
Thanks for the info...I considered both of them to be cores...though the older one has little wear around the exhaust port...

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8 months 2 weeks ago #15462 by Mike
Mike replied the topic: Rotax 503 Manufacture Date
Could I know when a 503 with S/N: 3346610 was manufactured?

Thanks

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8 months 2 weeks ago #15477 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Rotax 503 Manufacture Date
3346610 is not in the factory's electronic record system.

We do have paper records going back earlier, but I could not find it in there either.
If 3346610 is the correct number, (not a typo?) then probably it was manufactured before 1985, as we have records of some 335xxxx engines sold in 1985 - and that's about as far back as we go on paper.(We only have North American paper records here)

Are you certain it's a 503 aircraft engine? (Our two stroke records expert thinks that the 334xxxx range might be assigned to snowmobile engines.)

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7 months 2 weeks ago #15646 by Tim k
Tim k replied the topic: Rotax 503 Manufacture Date
I have a 503 I am trying to find the mfg date for.
M5658785

Thank you!

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7 months 2 weeks ago #15670 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Rotax 503 Manufacture Date
5658785 is a ROTAX 503 UL FAN produced 14-Feb-2003

original factory configuration:
with rewind starter and
starter rope standard
UL-reduction gear box B 2,58
NM - not assembled
with 2 Bing-Carburetors 887823
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2 months 3 weeks ago #16737 by Craig Fordahl
Craig Fordahl replied the topic: Rotax 503 Manufacture Date
My 503 S/N is 3764154 would you know the manufacturing date and details at time of build?

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2 months 3 weeks ago #16738 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Rotax 503 Manufacture Date
3764154 is a ROTAX 503 UL FAN manufactured 29-Jun-1988 (!!)
(there is no additional information in the factory database)

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1 week 3 days ago #17524 by tom
tom replied the topic: Rotax 503 Manufacture Date
How about serial # 3986639 and 4794003
Rotax 503
anybody.......
Thanks

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1 week 3 days ago #17525 by tom
tom replied the topic: Rotax 503 Manufacture Date
serial #'s 3986639 & 4794003
anybody.........
or is there a site I can go to and look them up myself?
Thanks,
Tom

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1 week 1 day ago #17539 by RotaxOwner Admin
RotaxOwner Admin replied the topic: Rotax 503 Manufacture Date
3986639 is a ROTAX 503 UL FAN produced 25-Mar-1992

4794003 is a ROTAX 503 UL FAN produced 26-Apr-1996

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