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Jetting for XR 416?

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I recently have had my 1998 400 bored out to 416. Aswell as being bored out the bike has a Xrs only muffler and header as well as a mikuni pumper carb. The new piston is 11 to 1 compression and I was wondering if I was going to need to lean out the jettting. My old man, who is an automechanic, told me u often have to lean out the jetting when installing a big bore kit becuase they tend to run rich. Just wondering if this was true? thanks for ur time

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