Re: Video of 1957 35 hp please help

[Don]

OK, watched the youtube video, and did see the engine jump/buck just once. I realize that you can’t judge much by the audio, because it surely can be deceiving, but the engine sounded loud and rattly to me. It looks like the lower cover weather strip seal is missing, perhaps the noise is just the motor cover rattling around….
I did see the engine jump/buck just once though, could be for many reasons. Try having an assistant run the boat while you gently place your hand on the shift lever. The shift lever will buck back at the same time as the engine jumps/bucks if it is actually jumping out of gear.
But like others have said, be sure you have the correct fuel/oil mix and the engine is pumping water….
I sure hope that I/we are totally wrong about the engine noises that we are hearing on the video, so sorry that you have invested all this time and money into this engine. Would love to see all the pricey repair invoices…