Yamaha Outboard 4hp 4-Stroke Silencer Air box Intake Manifold 68D-E4440-00-00 Flame Arrestor 96273A6 was used with engines

96273A6 was used with engines that had the cast coupler (round one that bolts directly flywheel studs) < That's what type this is

but Pump To Carburetor line is different as the 1990 models were using Holley Carburetors rather than the Rochester ones

but nothing that shouldn't clean up or affect functions

328004 / 0328004 / Stamped 328000 By-pass Cover (x4)

Yamaha Outboard 4hp 4-Stroke Silencer Air box Intake Manifold 68D-E4440-00-00 Flame Arrestor 96273A6 was used with enginesItem Details Removed from a 2001 Yamaha 4hp 4 stroke (F4MSHZ) that was in perfect working order but had a crack one side half of the crankcase casting Yamaha Part Number(s): (This list covers the major parts you might be looking for, however everything is included as pictured) 68D E4440 00 00 Silencer Assembly, Airbox, Carburetor Carb Intake 68D E3641 00 94 Intake Manifold Tube From my research it seems that this might be compatible with other Yamaha