Unfortunately the product fits badly . the holes in the head do not match. (sheet metal too large for what it is supposed to blind) .It looks like it is a part from a 125cc kit unfortunately neither the bolt spacing nor the overall shape match the head.
Engine 139FMB from moped TORQ WINDSTAR 50 - hole spacing of the cap unfortunately does not fit. Necessity to remake the product on their own. Nevertheless, the quality of workmanship good.