Look guys I let a couple comments get to me, I owe Brad especially a apology I am sorry man you have helped me when no one on here would, next time I will stop and think about what you have to say before I respond.
As for this bar thing there is what works on papper and what works for me, I honestly bought the saws this way like it or not it works, and works well, maybe it shouldn't I don't argue that, but it does work. I like it let it be, I believe that the 3/8 .050 skip tooth helps, I am also telling you this thing has some nut.
O.K. Clamshell design(now we are getting some where) so we are looking at something similar to the PM610 by Mac or Poulans new saws, where the only way to raise compression would be with a pop up piston. That means I need to find a good wielder and machinist. Perhaps mild porting would be the way to start. I retuned the carb and was amazed, apparently they tuned it to 11500, I brought it up to 12500, I think I can raise it more but would like to wait until I break it in more, but it wants more.