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That thing swallowed something .Look at the divet in the top of the piston that pinched off both rings .In addition to that while heavy oil to a certain extend might help a worn out 4 cycle it has little or no effect on a two cycle .In addition to that addition once a piston gets scalded and...

I looked it up .It's one of those so called low pollution contraptions ,49 cc bore . Throw the parts in a box ,in a given amount of time you'll find the repair parts . BTW using 20/50 wt oil is not a good choice for mix oil .

So then is a 391 a later version of the 039/390 ? I don't know because that's another number I've never even seen let alone worked on .However if it is there's a zillion after market parts for the 039/390 models .Matter of fact all I've ever done on an 039 was repaired a faulty clutch .

Well it is an 017/170 .It never was worth a whole lot .

Well first of all you need a good driver ,solid tip not tamper proof with a hole it .Those will collapse under strain .Good tool company ,Wiha of Germany who BTW make specialty tools for Stihl .A 6" T27 bit is around 8-9 bucks .It's made of vanadium steel,same thing car axles and wrenches are...

The shock mount is already out except a little bit under the screw .First thing after you give the saw an amble amount of compressed air is to unscrew the screw

Take a picture of the thing showing the offending part .

Most Stihls aren't hard to work on .You want a toughie try a Mini Mac .As far as the subject saw I've never even seen one .