I'm not sure of the purpose, but I believe the shape is intentional. Perhaps it has something to do with the offset crank journal?The missing chunk of the lobes may affect case compression?
Well I picked up a new craftsman 42cc(not the poulan 42cc) and took a peek inside. Its cylinder is different than the usual g4500 and 5200 clone, the intake is oval instead of the heart shape. The exhaust port has a large taper going from round at the cylinder wall to square at the exit. It has a huge catalytic converter. Its heavy for a 42cc especially compared to my ryobis. These are made for mtd.
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made for older mtd
46cc
last 38cc 40mm monster
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