Hi all, I could do with some advice as this is pissing me right off! I have two carbs, both freshly rebuilt to the same spec, 25mm venturi, 120 main, 1mm air corrector, 1st stage untouched, 2nd 1.2mm. FPR Is set at 5 psi at idle, float vv is std 1.7 and new in both for now. Neither of them will idle properly...
Carb 1
Runs fine when put on, then for no apparent reason goes way lean I have checked the idle jet is clean, it is, and blown through the idle circuit with my air gun, which gets it to run for a second or two then way lean and dies. I have stripped this carb two or three time (immaculately clean) and even changed the throttle plate assy, and still no good. Oh and checked inlet gauze is still there, and clean and also have a new fuel filter.
Carb 2
Idles at 9.7 (rough) and I have no leaks into the venturi now, it is dry. No matter what I do this carb won't lean out, and when driven won't get above 12.5 AFR. I cannot understand how this carb is overfuelling now as I can not see where it is coming through.
Can any one offer some advice! I am getting fed up with hanging carbs over ATM.