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That comp can be misleading .The 125 Mac I made the iron liner for can be started without the decomp .Which is a feat all in it's own because that is 123 CC at 7.5 to 1 to comp .The rings aren't seated yet ,simple as that . That thing however has gnawed into 54 " of silver maple with a 48"...

I wouldn't be too concerned on the comp readings .It will come up .Besides that too many people worry about comp readings and tachometers any way . When you are pulling that thing over to get comp readings that is called static readings or basically at rest .When it runs ,that is called dynamic...

Kind of funny ,on say the auto engines of 10 years ago,they were all shipped with "break in " oil .Really just oil with STP in it . The newer ones are so danged tight you have to run 5W 20 in then or they can't pump it .The new tolerances are in microns rather than thou s' .Tight like a mouses...

Without sounding somewhat sexist break the saw in somewhat gently then ride that bitch for all she's worth .You want to run them hard ,ride them hard .

I forgot to mention something that is paramont .Run maybe part of a tank then check your bolts for torque .Run two -three more and do it again . Let the saw cool before you put the tights to it .

To break one in set it slightly rich and run maybe 8-10 tanks of fuel through it .Then set it where it's supposed to be and run it like you stole it . When you get a new piston and cylinder from Stihl it's pretty well honed to good tolerances .If however you rering a piston you have to remember...