I wasn't sure if the moderators here preferred a new thread but since a slight change in subject only, i figured I'd pick up where i left off.
After getting nowhere months ago on my own, my father in law recommended a friend of his. He restores cars and knows this engine well. Just happens his neighbor is also a boat guy. They were willing to take a look. Long story, short; they took it apart, changed a rod, fixed gaskets, cleaned up scorching, etc. He rebuilt my carb and i got a new fuel pump. It seemed ready to go and has been running well on a flush kit to be safe. I did one quick 10 minute run with no family on board to be safer.
Went out today and here is part of the email i sent the guy. Any thoughts on this issue?
"We "may" have another issue. Not sure if it needs to go in the shop again?
Today we ran it. Did well. Ran at a decent bit of rpms. Stops and starts. Ran slow, no wake speed. Went wide open here and there. After about 2.5 hours we were cruising at good throttle, probably 3000 to 4000 rpms. Suddenly it was almost as if I let off the throttle and it cut off. There was a bit of smoke coming from the flame arrestor. The gauge did not show any overheating at all.
I took the hose off the flame arrestor that leads to the engine block. The small amount of smoke was coming from the hole in the engine block.
It eventually let up. I started the boat and slowly went to the dock. We arrived in about 10 minutes and no more smoke. Since we were close by and plenty of boaters we decided to run it hard.
30 minutes of running about 4000 rpms. Not a single sign of smoke or the same problem.
Would blow-by symptoms be constant?
I was hoping this is just old, non marine gas that sat for 6 months.
Seems we still had good power but not sure if that means much."
