Re: 1970 Yamaha Mariner 8 high speed issue

[billw]

I guess I’d try pumping the primer bulb when the event is about to happen. That will help circumvent a lot of problems associated with air leaks, restrictions, bad fuel pump, etc. This is, of course, a test, not a solution.

What kind of tank are you using? Modern plastic tanks are often plagued with problems. For instance, a lot of quicksilver tanks have their pick-up tubes loose and/or kinked. If you have one, I would pull the pick-up right out of the tank and give it a look.

If none of the above help, maybe you will then need to revisit the carb. By the way, Japanese carbs in particular can’t take a joke if they have ever had water in them. You can clean them and the corrosion will just keep coming back.

Long live American manufacturing!