RE: Is this a MVVS .49 or 8cc engine?
Earl
I have exactly the same model MVVS, a .49 green head.
It is the best sport glow I have ever owned.
I have wrung it out week end after week end since 2006 ... and it still has good pinch at TDC. A testament to the quality of materials.
It has never been run with Nitro. Also, always 20% lube, mostly all castor, sometimes 10% caster, 10% Klotz synth.
A carb upgrade using the new 8 mm carb, or a "nozzle kit" will really improve throttle transition.
Regards
Derek