Running in an engine is all about doing a certain amount of wear to the rings and cylinder bore surface. Unless some wear happens the rings may never seal properly.
When a Cylinder is bored and honed it finishes with many micro-ridges. They look like swirls going around the cylinder. After a while these ridges get smoothed off by the running action of the rings. The key is getting the rings properly seated before the cylinder micro-ridges wear off.
Since synthetic oil virtually eliminates wear it is forbidden during break in. Using synthetic oil during break in of an old school cast iron cylinder (which Gammas have) will result in poor ring seating and reduced power until the next set of pistons is installed. Assuming the next set is run in with non- synthetic oil :-)
Go to a car parts store and get 2smoke oil for a lawn mower. Drain the oil tank and replace it all with lawn mower oil. It's about 1500 cc of oil , so gets two bottles of lawn mower oil.
Gammas continue to run in the rings for about as long as it takes to go through an oil tank's worth of
Milage.
