from
http://www.mvvs.cz rpm with props using tuned pipe 3268 + header, pitts muffler 3271, and dustbin muffler 3298. The last indeed leaks, as the two halves are not soldered together. They can be brazed though.
No tuning is required with the original MVVS parts.
engine 35 IFS
APC 20/8 7600-7700 3268
Mejzlik 20/10 7200-7300 3268
Mejzlik 20/8 8200-8400 3268
Mejzlik 21/10 6600-6700 3268
Mejzlik 20/8 7100-7200 3268
Mejzlik 20/10 6300-6400 3271
Mejzlik 20/8 7300-7500 3271
Mejzlik 20/8 6700-6800 3298
These rpm have been reproduced by many in the field.