I don't wanna call the 268 a build because I didn't do any porting, just stripped down to case, cleaned and replaced seals & fuel lines, new meteor piston from Baileys, saved the cylinder, rebuilt carb, antivibe elements OK, replaced starter cord, then reassembled & tuned ran 4 heat cycles then ran with 24" hardnose off the partner w/round tooth semi-chisel of unknown mfg fresh off the grinder.
before
http://i1001.photobucket.com/albums/af131/hupacl394/268/100_4201.jpg
http://i1001.photobucket.com/albums/af131/hupacl394/268/Copy2of100_4198.jpg
http://i1001.photobucket.com/albums/af131/hupacl394/268/Copy2of100_4198.jpg
http://i1001.photobucket.com/albums/af131/hupacl394/100_4170.jpg
you can see how the air flows from the filth accumulation
http://i1001.photobucket.com/albums/af131/hupacl394/100_4172.jpg
before
http://i1001.photobucket.com/albums/af131/hupacl394/268/100_4201.jpg
http://i1001.photobucket.com/albums/af131/hupacl394/268/Copy2of100_4198.jpg
http://i1001.photobucket.com/albums/af131/hupacl394/268/Copy2of100_4198.jpg
http://i1001.photobucket.com/albums/af131/hupacl394/100_4170.jpg
you can see how the air flows from the filth accumulation
http://i1001.photobucket.com/albums/af131/hupacl394/100_4172.jpg