447 vs 503 SI

[BigAl]

Hi Guys,

There are a bunch of guys on the forum with loads more experience than I could ever dream of, so here goes.........

What are the differences between the Rotax 447 and 503 SI? Are there parts which are/could be interchangeable? The termination of production of the 503 SI has lead to a scarcity of parts and I was wondering if buying up a 447 as a source of parts for a 503 SI is a viable proposition or not.

I look for to your input with interst.

Best regards,

Al

[Morph]

Two completely different engines

Looks like the carbs, electricals etc are common (stator coil unit 996849 on both)

I can email you the illustrated component catalog and you can have a more detailed look. It is almost 10MB of document so make sure your mailbox allows large documents

[BigAl]

Hi Morph,

My mailbox will accommodate a file of that size.

Many thanks for your help.

Regards,
Al