waterproof paper gasket, special thickness, between cylinder and crankcase
check crankcase joint is level, use sealant like hylomar
I have a video on youtube about this procedure
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reasons you might want to remove the cylinder(carefully not to damage brittle piston)? :
service cylinder cooling jacket and derust internally on your bench, to keep your boat clean
decarbonise and hone cylinder to improve reliability and power
replace piston rings after it was seized with chromed ones
replace engine main bearings and crank seals
re-thread broken coolant outlet banjo that often clogs and breaks off rotten.