Chainsaw Repair

The 116S, 120S, 6000, & 6800 all had  the same 36mm stroke as the Husky 365 Special and 372XP but the bores were smaller.

The closed ports on the Dolmars were of the old style upper and lower window design using a windowed piston. The lower transfers were not in the base flange area of the cylinder and crankcase. Some of the Stihls were this way. You cannot do as much porting on these as all the port dimensions, piston skirt width and lengths were all mathematically worked out to coincide with the port spacing on the cylinder. They ran pretty good they way they were.