So... I tore the carb off my bike last night to clean it and re-jet, and found that it had been ported/polished. I bought it from a semi-pro racer and had not realized it was ported. So now im stuck with trying to re-jet it. It has a yoshimura TRC pro series titanium exhaust. The jets that were in it were, 165main, 45 pilot. It pops and backfires under deceleration, so i figure it needs a bigger pilot. It would seem that it should have a larger main jet due to the port and polish and the exhaust. The plug seems to be a darker chocolate so should i lean it out? Elevation is around sea level. Any help would be great, and whats the gain of unplugging the TPS?