RE: Prop for a MVVS 40
Eftychios,
What determines if it is a Quickie, or not, is the port timing.
The Quickie sleeve has/had 165-170 degrees of exhaust timing, while the normal sleeve has about 155 degrees.
Also, the old #3068 Quickies had the old 8 mm #3219 carburettor and new Quickies have the new, 9 mm #3219Q. This engine has a 7 mm carburettor...
The two-part head on some of the older Quickies was black. I don't think that MVVS ever issued Quickie engines with heads of other colors, until the current version, which has a gold head.
This engine is more likely to be the normal #3066 6.5 cc engine.