trexloans

Thanks for the reply. I was able to solve the problem. It turned out to be my plug cap causing a weak spark which in turn caused the left cylinder to have excessive fuel mixture mimicking a carb problem when it wasn't a carb problem at all. What a relief!

I just had my cylinders bored new pistons. rings & stage3 port job. I ran it through clymer break in process and it seemed to be runningn lean so I put 310 mains in and tried again to find the right side cylinder running correctly plug chop shows perfect ring while left side is showing rich condition. t seems to be running rich troughout entire operating range which makes me suspect leaking float valve but I've checked the float height to be correct and the valve appears to be shutting off with no fuel running from overflow. I thought it may be the choke hanging up but I checked it by putting a small hose on the float pick up tube with bowl off and I can't blow through it with choke in the off position and can blow through in on position. I've check all jets and air passages to be correct but still have this rich operating condition on the left cylinder. I've checked spark to be correct and have ruled out electrical? Anyone out there have any suggestion?