From memory the 55s used to snap conrods on a regular basis. Foxhangers Marine (now defunct) used to have a pile of dead 55's outside that he gave away to people.
I'm fairly certain it's not a 40-the twins are all hard to distinguish from 40-60hp but 40s of this shape are actually quite rare whereas the 50/55 were a common sight. It's the engine the 55hp yamaha twin was based on but not as good
Def not a 30-this is a 30...
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