Starting to bench run a 2300 which I got last fall from a distributor NIB (China made). Followed all the advice about fuels, settings, and large tubing and have no problems in starting or running. When I started the breaking it in I noticed the engine had very little compression and with fuel in it some compression. After 1 Gallon of fuel there has been no change in the amount of compression. In breaking in a new ST 90 ringed last fall, there was all types of gray residue in the exhaust oil for first few tanks of running. The 90 has a lot of compression. There was no gray residue during the first runs of the 2300. I have a never been run ST3000 that has super compression and a friend is breaking in a new ST3250 that has a lot of compression. Will this compression level improve with time or is this unique with this engine in that as it heats up, tolerances change and compression increases. Bob Ohio