5/29/2023 0 Comments Mikuni bs28 carburetor manual![]() I just find it rather unusual that this carb would be tuned too rich. If it is just lightly sooty, then a single step down (Say a 110 jet to a 105 jet) will probably be enough. Based on the condition of the plug, you can make a judement on what direction to go up or down. Put a fresh plug in and find a place you can run at WOT for a decent run and kill the ignition and pull in the clutch at the same time and come to a stop, pull the plug and see what it looks like. If it's just too rich all around, then the best way to do this is to start with the main jet. ![]() If it's too rich, the first question is, where is it too rich at? Too rich at idle? Too rich at WOT? Too rich in the half-throttle range? Those questions will determine which jet to look at first. Too many variables come into play for any of us to say "run this primary, this main, this needle" and it working the best for your bike. There really is no end all-be all guide to tuning a carburetor.
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