RysiumM,
This type of mounting is used on engines as an after-thought, without any 'beefing-up' of the crankcase bolt threads and bearers. I have not seen any damage done to the crankcase from this unorthodox mounting method (unless a crash occurred), but I have not seen it done on any MVVS 1.60 either.
The thread size of the back-plate bolts appears to be 3.8 x 0.7 mm (eye + vernier caliper estimate).
You may want to contact MVVS head engineer Mr. Josef Å*vajda, maybe even in Czech, and ask him directly, if this will hold.
The E-mail is;
[email protected] .
You may want to ask him to select one of your 'valid answers'...