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I bought a guy out who had a lot of Mc Culloch engines and parts There are 6 complete engines, and boxes aof parts. Blocks, cranks, and all other parts. But there are on ID on the engines. How can I tell which engine they are? Any help would be useful. THANKS
Mc49 obvious with fixed head. Port variations for each version
Mc7, 8, 9 will be stamped with correct model
Mc90 has oval exhaust port with three little finger ports
Mc91 has 2 exhaust ports and square boost port slightly higher than intakes
Mc91A has 2 exhaust ports and square boost port same height as intakes
Mc91B two large finger ports
Mc91B1 two large finger ports and thick top fin
Mc91M/C has compression plug
Mc92 has two ball bearing crank with recessed head gasket
Mc93 has two ball bearing crank with standard head gasket
All Mc101 models will have a side cover gasket, not oring, and notched for crank to fit. Also is one fin taller than 100cc motors
Saw motors will be a little more involved, save time by description if not stamped.
