Thereís not a lot you can do to improve the speed, other than play around with the sprocket ratios Ė but if you do that, what you gain on one hand, you lose on the other
You can get a bit more response from the throttle if you play with the carb, though thatís not my area of expertise, Iím sure someone who can help you with that will be along shortly
Exhaust pipes Ė now thatís the way to go Ė if you like loud pipes that is. But although your ears will tell you you are going faster, in fact, you wonít be
If youíre on tarmac, tire pressure can help Ė as can tire choices
But first and foremost Ė get used to the bike as is Ė you may be pleasantly surprised
Judging it by your previous bikes is not the way to go ÖÖ
Welcome to the board ....