What size jets does your 228s have for the 261 setup? I'm having trouble finding any info on jet sizing other than people talking about adjustable jets. As of now, I don't plan on having much altitude variation. I live at 1300'.
I was able to find that my Zenith 11658 has a C52-7-34 Main Jet. Some of the other Zenith 228s for 270s have C52-7-33 Main Jets. One would assume the 34 has a slightly larger orfice.
Sorry, I don't know. mine both have adjustable main jets, which is both a blessing and a curse. You'll just have to start with the stock jetting and vary it from there.
I live a 2,000 feet but regularly travel from sea level to 6.000 feet. I find that the idle mix needs adjustment if I'm at altitude. When I get to the low desert (cold, dry air) I richen up the mains a quarter turn. If I don't, a valve begins to stick open as the guides are a bit too tight. Along with that there is the danger of a burnt piston.
