Are you talking about the primer lever that’s attached to the fuel adjustment needle?
Is this a similar motor?
This one is a 1946 Sea King
3.3 hp, twin opposed
Model 64EA 9008A
Mine has a “poppet valve” carb, so there is no sync. between the carb and spark advance.
The primer lever is set after you find a good running adjustment on the fuel knob, then
adjust the primer lever so it pushes down the float pin as you “richen” the motor,
turning the knob.
Prepare to be boarded!
