only 49cc(mopeds)and 125 cc(learner limited)are "restricted".60mph sounds about right for yours.manufacturers have to balance top speed and fuel consumption to sell to widest market.there are all kinds of mod's to change this but all cost.on smaller engine's,the harder u squeeze for more power,the harder it squeezes u'r wallet.the cheapest option is always more cc's.
caine, September 2008