That Mr Gasket material is very similar in composition and thickness to the Cometic exhaust gasket material I used to make the head gaskets for my Champion rebuild. As you noted, I used an Exacto knife to cut out the cylinder openings. But I wondered if there was some way to first make a drill guide by cutting out the cylinder holes in a block of wood or piece of metal plate material with the appropriate size hole saw, then clamp the gasket sheet between the wood/metal drill guide and a 2nd backup block, then drill out the hole in the gasket with the hole saw. Using the Exacto knife on mine worked OK, although the edges of the cutout were just a bit ragged. Of course, I don’t have the fire rings on mine either but it seems to have worked so far (although I don’t have any serious amount of run time on the new gaskets yet).
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
