I recommend getting an air/fuel gauge you can look at while driving it around. I bought a new 750 and the springs/rod kit for my 48. It was too rich on the highway and I ended up using the leanest combo of jets and rods on the supplied chart to get it close. I never would have figured it out without the A/F gauge. I think it was 150 bucks or so from summit... I don't remember the brand.
