Steven

I use a MVVS 61 on my Taurus and it is a very reliable engine, less complicated than the OS Max 61 FX I also use.
Never had a dead stick with this engine also not with a MVVS 7,5 ccm 0.45
I use the engine with the standard muffler and a fuel pressure regulator near the carb(as Cline). The regulator I always use.
The engine they give to me because they couldn’t handle it, I think they did use a wrong muffler or pipe.
The engine is very powerful but I do not have measured values, I only do data logging during flight.
I use a propeller 13 x 6 on the Taurus of about 4 kg.
Testing the engine I would do on a test bench, also to check fuel tank/engine position in “nose up” position without the plane.
If you have any question I will hear from you.
Do not forget after running do not change the exhaust position anymore!!!!!!

Cees