20-30kph , running without the exhaust can will speed it up 5-10kph , special tuning tips are available that mount directly onto the header pipes and you can tune them in, to get the most out of the head pipe.
Speed also envolves other stuff which could either slow down the bike or make it faster.
How heavy you are
What surface your running on
What tyre pressure
What gearing
Up hill or down hill, some hills may have a slight slope in them which isnt realised by you but does by the bike.
I would say around 60kmh
As i know my MSO Pro 140cc can do near 90kmh if not more.
um i got a 110cc with no muffler atm n it does close to 80kms per hour on the road next to my mates car n i wiegh 55 kgs or so n there was not really any slope i could notice that not to say there isnt one but so the best way to tell wta speed ya bike goes is get a mate to drive next to u
i not sure wat sort of engine it is but its a 04 pit pro n had nno exhaust on at the time we checked it again yesterday i could still get around 75kms hr i dunno maybe its a freak engine no mods i know of to engine MySpace.com - $$OW3Y$$ - 20 - Male - g town, AU - www.myspace.com/owey87 in the first picture album theres a few it the black bike