I`m wondering how come the new and expensive 50ccm mopeds achieve 100km/h and more top speed.Where`s the difference with older bikes??? Even my 125ccm road motorcycle has a hard time achieving 100 km/h !!

Re: evolution.

The Derbi GPR Evolution has very high compression it is a premuim fuel only bike. Uses water cooling to remove all the heat from the high compression. Very large ports, Reed valve induction , a large Dellorta Carb. Expansion chamber exhausts.

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