Unless you do a proper plug chop the colour doesn't mean much unless it comes out lean or really wet. A bike will often need to be set rich at idle so it will pull well when opening the throttle. I always found a 38 pilot best at sea level so in theory you might even be able to run a 35 but it is better to be a tad rich than a tad lean. Take a step at a time. I wouldn't worry if it was coming out a bit black but not wet at idle. Best way is to get a few jets and try them just be real careful going lean on the main or needle - step at a time and do proper plug chops. Last thing you want is lean at revs and high throttle openings. If you can consult the jet database on here get a feel for what people are using at your altitude, also check the correction factors for altitude from known good setups at sea level. The standard UK (sea level 20 deg C) is 38P, 178M & N1EF needle on 2 or 3. But I found better is 40P, 180M, CCK needle on 2 or 3.
|