Is this a new problem? were you at one point getting more then 53mph top speed?
It's all on pg2 of this post but I bought the bike not running from the original owner. 53mph on flat ground is the best I have been able to do. As I said earlier, I am kinda big for this bike but thought it should do better than that. Maybe not? Is 6' 295# asking too much? (I really need to lose some weight...)