tothemax93
Well-Known Member
I have Marks 4-1 with the needles shimmed .30. Its running good. I've been racing and the times are what I think are respectable. I decided to look at the plugs after I raced last week. it looks like its running pretty lean. My question is, what do I need to do to richen it up a little. I know that the A/F screws are designed for low RPM's. Would I start with those, or is this a needle adjustment. It runs the same all the way up though the RPM's. Which way would you turn the screws to richen it. Any other advice would be appreciated. My next real step would be a morleys kit, but a little low on funds for now. I have to work with what i've got.