Rotax 4 stroke from the 1980's

[scottessex]

The Rotax 906, tested but never went into production.
http://delta.wtr.ru/files/rotax906.jpg

[helipaddy]

Here is another one Scott that is not seen much, The rotax 508. I think it has alot of parts common to the 503.

[phantom]

I don't know much about the 906 but the 508 was a complete failure and while it looked some what like a 503 I can't think of many parts that the two shared other than muffler springs.

[PW_Plack]

The 906 seems to have anticipated the HKS 700.