I need a helping hand regarding an MVVS 58 Prosport (identical to the Evolution 58 GX2) engine
I have a brand new MVVS 58 Prosport, mounted on a 3D plan, equipped with an MVVS pitts muffler and rotating a VESS 24B propeller
The engine went through a break-in exactly as per the manual, and burned until now app, 2.5 gallons of fuel, were the first two were run using 98 Octane unleaded gasoline mixed with 3% of the supplied break-in oil, and the following 1/2 gal. was run using 98 Octane unleaded gasoline mixed with 2.5% of redline racing oil (the same one used in my DA 120)

Now for the problems.

1. The engine high end RPM is around 6100. It seems to be on the low side as my Chinese JC60 turns the same prop 100 rpm higher
2. The engine is not working "smoothly", mainly on the low to mid range
3. Engine vibrates much more than expected (prop is well balanced)
4. Most sever issue: The engine – when warmed up just a bit - after idling for more than 15 seconds straight – refuses to accelerate and cuts off immediately if throttle is advanced at more than a very moderate pace.
5. I have tried the following, with no noticeable change / improvement:
a. Removal of cowling to rule-out cowling-related over heating
b. All combinations of carb. needles setup
c. Replacement of spark plugs
d. Replacement of ignition battery
e. Setting of the ignition both to long – exhaust and short exhaust modes
f. Replacement of the entire fuel system (tank and tubes) with one taken from a perfectly functioning other model (the one with the said JC60)
g. Removal of the carburetor and checking of all diaphragms for flaws – non found
h. Check for dirt or clogging – non found
i. Bending the metering lever a bit upwards to allow more liberal fuel flow into the carb under acceleration

I am really out of ideas and would love to get some insight about that issue