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I have a 300ex with 400ex carb. I just got a dyno jet kit and did not realize it was a 400ex carb till after the fact. Do I need to rejet since its a bigger carb. I am not sure what to do and need help please. I am running a new aftermarket DG pipe and am on a small budget.
if you want to run the dynojet kit, then get the one for the 400ex. as far as jetting goes, try doing a search on here and see what people have used with stock size engines. i had one on my 300 with a 380 bore kit, and i ran a 162 main and 48 pilot, with the needle in the 3rd position. a 150 main and 45 pilot should be safe for you to start with. also, remember that the dynojet main jet sizes aren't the same as keihin jets, so a 150 dynojet is not the same as a 150 keihin.