Chainsaw Repair

Now I have a very vivid imagination so bear with me .An idea which may or may not work .It's only theory and conjecture that it might .Application would be a race engine .Much ado about boost ports ,finger ports ,external ports and the like .
They all do about the same thing only use different methods .So what would happen if say a stock cylinder were bored 15 thou over ,finger ports ,shallow cut in the cylinder wall .Could be two,could be 4 terminating right above the intake advanced 3-4 degrees ahead of the main transfers ,press in the sleeve .Cut the sleeve further down to ID size with port mapped template and do the ports .You'd probably have to stay fairly close to stock bore to save the cylinder wall strength .

What you could get might be better than externals ,that much advance before the main transfer would really boost the velocity .You would not need to reverse the piston or move the ring pins or worry about snagging a ring .Cut the extra ports with a hard upward angle to sweep above the intake but enough not to short circuit right out the exhaust .Who knows might work .It also might give you enough extra sweep you could leave the exhaust port long and really hang on to the torque .

+1 lots of potential there.  with a sleeve, think the possibility of lowering the exh roof would also be available for a torque style build.