My SC 1.08 is an ABC so some of the larger engines may not have rings. With the MVVS I think it would be wise to take off the muffler and look through the exhaust to check if it's got a ring or not. If it's ringed then run it in much the same as a cast iron piston, slobbering rich for the first couple of runs then almost at the point where it breaks into a 2 stroke for a few more runs. Then some shorter runs at a rich 2 stroke to start hardening the ring. If it's a ringed ABC then it should last just about forever