If its a 4 stroke it sounds like a burnt valve or head gasket, if a 2 stroke a bad pack,coil or keyway can cause this,...
The exhaust is expelled directly from the engine using straight pipes through the stern of the boat, above the water line. Normally high speed boats are equipped with these types if exhaust system.
90 dBA
In California, under no circumstance can a recreational boat's exhaust sound exceed what volume in decibels (dBA)?
90 dba
Under the starboard side exhaust manifold and connected into the main engine flywheel
an exhaust muffler an exhaust muffler
exhaust muffler
In Georgia, an exhaust muffler is required to be installed on a recreational use boat.
Boat's exhaust systems are located on the middle unit of the Outboard motor, but some of the fumes get in the water.
Exhaust muffler
Exhaust Muffler
an exhaust muffler