…. where to buy parts outside the Rotax universe.
Generally only reliable and proven parts and sources are listed here

If you would like to contribute something here, you are welcome to send me an e-mail to wiki@kleinjung.de.

programmable ignition modules for Rotax 912 and 914
… the source of supply

In England there is apparently an approval for the Europa at:
https://www.theeuropaclub.org/building/europa-mods-and-sbs/laa-standard-mods
Unfortunately, I do not have access to the site and therefore cannot check whether the document could also be approved in Germany.

special parts for the Bing carburetors
…. not from Rotax….
This is only linked here because it is already available in the carburetor section.

part numbers of the copper sealing rings
… and their sizes, if you want to get some on the open market.

Universal radiator cap for 45mm connection (1.2 bar)
Price: 19,89€
- even if you only use the rubber gaskets, it is a cheap solution to have a working radiator cap.

The radiator cap from KTM
RADIATOR CAP SMALL 1.2 BAR
Item number: 49035016000
14,76 €
incl. 19% VAT

After the black radiator cap was already criticized by a pilot, I actually think the cap from KTM is better.