I knew youd be the first to respond.I sent the other cyl"s(2) to frank for new rings since he didnt have the correct size so hes fitting the rings to my pistons and cylinders.I have 2 echo hedge trimmers with 21"s on them that run so i might pull one apart and see if the pistons will fit rod and cyl case..I bought 3 14cc from indiana but unfortunatly the base is smaller so the cyl bolts dont line up.So im trying my own twin.I tried to drill the crank like you guys did on your bme"s but i dont have a carbide bit or boring bar(my bar is HSS).
On another note,if im right.If the pin for the ring rides in the corner of a cylinder between the ports,ect,then the bridges arnt needed because the pin(ring end gap) is in constant contact with the cylinder wall.The piston on the right has no bridges where as the one (2) that came with my twin have a full bridge on exhaust and only have a half of one on intake.Well,ill see how it runs with franks upgrade.Who sells carbide bits for less?