Originally Posted by Jumpa
Dood if you want to notice more power get rid of that cover and get some air in that carb sound silly but it works trust it!
It seems true. When I got a performance air cleaner from Sick Bike Parts and mounted it on mine - OH, that engine opened up and BREATHED! I have a tuna-fish can that I painted and covered it with, to keep it from getting too well covered in debris. But that turned out to be a major performance mod for me.
Before that, all I'd done was port-matching, VERY slight milling to the head, better NGK spark plug, tuning the carb, bigger inside-diameter copper fuel line, better gaskets,...the standard stuff.