what muffler do you have on your hobbit, they can be extremely restricting in mph's as well as idling and performance. i have the proma circuit on my bike and it goes like 38mph. they sell the pipe at www.westcoastmopeds.com or 50cc.nl and they also sell the stock exhaust at 50cc.nl or westernhillshonda.com. don't get rid of it. thats my suggestion.