Silence the Hankai 4 HP 4 stroke

[Pistnbroke]

I just have a small boat for the local canal and power with a Hankai 4 hp 4 st ....Noisy thing BUT if you examine the leg you will see a 17mm hole at the top used on the 2 st version for the exhaust.....it exits above the propeller. See Boiler dan1 pt 2 at 12.06 min on you tube
Remove the silencer box and fabricate a feed pipe from the exhaust port to the leg .....Silence is golden.