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Fine and dandy but what caused it to hang up???

The port work is up to you . An 066/ms 660 has enough go -get -em already without doing a thing to it . My suggestion if you've never done port work to a saw is leave it alone. Practice on a more inexpensive saw first before you get to tinkering with one that costs over a thousand bucks to...

Only a suggestion but clean all the dust off that saw before you disect it in the future .Dirt inside of an engine can be your worst nightmare .:O By the looks of the top of the piston and ex port that thing is running plenty rich enough,maybe too much so .It may have a snag in the corner of...

I doubt you scewed up a wrist pin. If you pulled some aluminum on the piston just clean out the bore,shine the piston, new rings ,off to the races .Those damned pistons don't have to be as perfect as most would think .Once the new rings get seated you most likely won't be able to tell the...

If the thing was running lighter oil mix and running hot,running them out of gas is not good at all . Pull the muffler,take a peek .If it's galled don't panic ,it can be saved for not much money .[usually]