Cplanes,


I would say it can be pretty old.

Until adopting the fixed trend, about two years ago, of using the blue head for engines up to .49 and gold for the competition models, MVVS used many different anodized colors for their heads. There were red, brown, black, gold, green and neutral heads and those were in all .40-.49 sizes.

The larger engines used only neutral and black that I know of.

If the carburettor has a sealing ring near the bottom of the spigot, and/or a springy high speed needle, which threads outside the nozzle, it is pretty old.
If it is a rigid main needle, with an idle stop screw on top of the carburettor, it could be 3-4 years old.

If the side of the engine has a large 'm' casting, it can be pretty old.

MVVS engines have always made well above average power.