For for my friends on FHC yes you can actually “Bore” a cylinder on a chainsaw, off corse it has to be done in a machine shop. All piston failures are caused by scoring of the cylinder, mainly from lack of proper lubricant, wrong mixture of gas to oil ratio or running the saw to lean meaning someone has adjusted the high speed jet to lean. Another big mistake that I have encountered at my shop is I had a guy tell me he couldn’t be sure which was the high and low adjustments on his saw so he had the bright idea of taking of the shroud cover to make his adjustments with no knowledge of saw cooling and how it works on a saw. That was just asking for piston failure because with the shroud off first the saw cannot and will not cool the piston and cylinder properly. This is a no no on all chainsaws beware of what you are doing before you tamper with the high speed jet. The person actually melted his piston and sized the saw.Now he had two problems a new piston and may need a new cylinder in the process of plain stupidity. Sometimes we are able to salvage the cylinder but it takes a lot of manual hand work if the rings have scored the cylinder it is not feasible to try and save the cylinder, if has just wiped the aluminum on the cylinder wall you may be able to clean the cylinder with lots of hand work. Hones will not work well on aluminum because they tend to load up with the aluminum scuffed cylinder walls. Gas octane will also cause piston failure, always use fresh fuel high octane and proper mixing of oil to gas ratio and will get many miles out of your saw. Have a nice day. Stumper
