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OK, please tell me more, if my plug is showing rich in economy speed then where is the problem?
the problem can be in any circuit involved in low speed .. like pilot jet .. pilot air adjustment screw settings... Needle Jet.... and jet needle ..
now the things that can be suspect are pilot jet .. needle jet and jett needle .. like mentioned above .. lower the needle in the clip .. that is raise the clip one notch above and again check ..
for high speed its entirly main jet .. replace with same number main jet ...
all in all i would recomend u to claim it in warranty if it is in .. else buy the carb jet kit .. which should contain alll that is replacable in carb ..
these holes in jets are precision drilled .. and i may be possible that one is wrong from factory .. so in this case replacemnt is the best way to solve the issue ..
also make sure ur float level is ok .. check it from a good mechanic who has tools to check it..