i'm running the oem ngk's 'almost' sidegapped. i lopped all but 2 pubimeters off the ground past the bend (easier to gap that way). not sure if was the new plugs or the cleaned out air filter(that had 2 cigarette butt filters in it ) but she's running much much better now. no popping and good hard acceleration. the carbs are still not quite right though. i'm gonna spend the money on a balancer as i find its required more often than oil changes.