Is that the egr sub valve you talking about. Another troubled Mikuni item. Besides the wax pellet, carbon would crust all over that egr valve on them darn carbs. I was constantly getting a sticky peddle from it. Had a dealer also be told to replace my carb by corporate. Dealer said carb wasn't a smog item, lmao They were very wrong and main office reamed them a new one. Funny how nice a dealer is after a good push up the butt from the big bosses at corprorate.