If you want a factory spare try Pe Reivers at:
www.mvvs.nl
Easy to deal with and easy to order from.
Another option is to email the spares dept. at the factory "MVVS, spol. s r.o." in Czech Republic and ask for Sabina (who communicates in excellent written engilish):
[email protected]
or Josef Å*vajda for technical queries:
[email protected]
He designed many of the engines for MVVS and works in spares I believe to this day.
Purchasing from the factory is more difficult as there are no "on line" point and click facilities.
Factory web site:
www.mvvs.cz
(on home page, click on "Union Jack" flag for english text)
Carb spares:
http://www.mvvs.cz/cenik/EUR/zhav%20karb%20eur.pdf