Well firstly the term break in usually refers to the seating/bedding of piston rings into a new bore. How does this happen? Gas pressure is responsible for this as it forces the rings against the cylinder wall. How do we get lots of gas pressure? We put the saw into running conditions that promote this....load and throttle is what is required to create the most pressure. You only get a small window of opportunity to get a good break in, all saw will break in no matter what you do but to achieve a good ring seal that resists blow by is what we want to make power. As far as oil mix ratio's are concerned mineral oil will do a better job than synthetics and more oil will help. Heat cycles are a thing of the past, machine tolerances are much better today than years past so the idea of 'going easy' is not good practice. As justsaws mentioned if a component is going to fail, it will do so whether you go easy or hard, its just a matter of time/conditions. Running a saw out of wood WOT is not creating the conditions required for good break in,idling the saw for the first tank is about the worst thing one can do. I won't even start a new two stroke until I am ready to break it in properly. Get it right and you will have a saw that makes more power than one that has been poorly done, you will also avoid contamination from blow by which we don't want. If you insist on running full synthetic oil do so after break in is done. Hope this helps.
