Re: 6hp 1960’s rich at high speed

[chris-p]

Wonder if at that throttle position, 1/3 throttle, a plug wire is worn and it is only running on 1. Have you pulled the plugs after noticing this condition>>? Is 1 of them overly wet? I have had a motor that rubbed at a certain throttle setting and would ground that cylinder at that exact spot.

I would run it with neon spark testers inline, and watch them to see if the spark is consistent as you throttle up to rule that out. If all is well there, you know its fuel related. Just a thought before you pull the carb.

But try a different orifice as well in case its bored out by a previous owner.