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Hi ive got a kymco agility city 50 4 stroke and i need some help. The nike has 6.5 g rollers and everything standard its just derestricted and goes only 37-39 mph flat. Its quite quick of the line but once it gets to 10mph it takes forever to get to 30-39 . What could i do to get that top speed to 45 and have that mid way acceleration better so when i pull the throtle i can feel that the bike is actually pulling not just building up the speed for ages. Biggest problem is when im stuck behind some idiot or learner driver at 20mph and i cant over take him as i have not got enough acceleration. Would be greatful for any suggestions.