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--but the point is any 120 cc saw is a big timber machine .Sure you can put "taller " gears on it but most generally on smaller stuff you normally would not use this large of machine . Try it for a day with a 24" and a 9 pin .That big SOB will wear you out .

Even chrome alloy or tool steel rings wear in .Maybe not as much as cast iron but they do change a little bit after some run time .In addition to that things like bearings need some run time to get rid of parasitic losses simpley because they are brand new .None of this is a big deal but it is...

It's been so long since I've owned a "new" saw I forgot much about the run in .However I've rebuilt a bunch of them and they do pep up after a break in period.When those rings finally set in you can tell the difference . Lean -er-out and run it like ya stole it.

If the thing is running hot on long cuts like milling it might help to fatten up the high speed jet just a tad bit .In addition to that a highly restrictive muffler doesn't help the cooling either .