picture? never heard of a series "a" moby. There are different versions, 20,25,30 mph. Dimoby or váriated? Theres a couple threads right below who are going from ss to variated but thats gonna cost money and is not going to make the bikes top speed faster.
How fast r u at now and what do you expect? Best free mod is porting. We all like free mods, red is the fastest color too.