Because they actually tested it, and found benefits. Worth pointing out here that Renegade, JHS, Dynojet and Factory Pro all indepentantly developed their jet kits, and all recommend the exact same thing, while not one jet kit producer for the SV recommends against this. It's clearly not a money-making scam, as the jet kits cost the same as equivalents for other bikes with less parts.why is it that the instructions on a jet kit tell you to do it?
****, you would think they can figure out mix screws considering they are perfect with slide hole. I don't think you should have changed it, you made it worseMy bike was jetted fine from the factory. I did have to adjust the idle circuit screws. Right now the front is 1 1/2 turns out, the rear is 1 3/4 turns out.