Re: How do I know if my carb butterfly valve is full open
The engine runs fine. For 'link and sync' there are two control arms that I adjusted to the specifications in the user manual (really not much of an adjustment, 1/2 to one turn of the arm), and then I adjusted the timing stops for idle and WOT. With my old Johnson engine, at WOT, the butterfly valve roated 90 degrees which makes sense. But, on this engine, at WOT, it seems like the butterfly valve only rotates 30 to 45 degrees. I can't see the insides of the carb, so I can't see the butterfly valve, but from the outside, the valve only seems to rotate 30 to 45 degrees.
I'm just trying to get a basic feeling for my engine. If I could get more performance, I'd like to. The tachometer on my dash seems to be a little high also, (7500 RPM at WOT and 3000 RPM at idle, but it doesn't sound like 3000 RPM). I guess I'll break down and buy an inductive tach and see what is going on.