Some one has used a,"Honing" tool on the cylinders in an attempt to get some more mileage out of them.I used one on a set of barrels on one of my old Hondas.Worked a bit in oil reduction if done right but not a real fix compared with a re-bore and new pistons.As my Hondas had integral barrels it was a cheaper alternative than a re-bore and got another 10k out of that engine before it got too bad and became a ,"Two-Stroke"<grin>
I only paid £25 for the engine so........
HTH
