Honda Outboards BF40A/BF50A Service Manual, Page 340Get this manual
BF40A-BF50A
4CARBURETORIINTAKE MANIFOLD INSTALLATION
1) Install new intake manifold gasket onto the cylinder head2) Install the carburetor and manifold assembly and loosely install the mm cap nuts, fuel tube clamp and 32 mm flange bolts[1] CARBURETORIMANIFOLD ASSEMBLY
[2] mm CAP NUT (2)
INTAKE MANIFOLD GASKET