Hey all. Thanks in advance for your input. I am a Stihl guy, but all self taught (Youtube, Arboristsite, etc....) Since I retired I have been buying a few saws and my grandson and I repair them and resell. We are both learning so much. I took in a 391 with a lot, and it is all there, looks decent, but the piston is all scoured up. The cylinder does not look that bad. Appears to just have some discoloring. Question on honing. I have zero experience in the machine shop field and have seen these honing devices (that do not appear to be that expensive) If I honed the cylinder lightly, and it cleaned up, do I then take a micrometer and measure the inside diameter of the cylinder and then buy a new piston kit, with oversize rings? How would I know what to order? Or, do I just bite the bullet and buy a new cylinder and piston kit? I couldn't afford OEM, that's for sure. What's your thoughts. Something I should even play with or is it not worth it. Thanks so much !… (**** I grabbed the wrong cylinder for the photos below… photos are of 034av, but the 391 cylinder looks about the same.) thank you all for your comments. have a 391 p/c kit for the 391 on order!