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jin lun 125cc t13?

i have a jin lun 125cc t13, ihave changed the exhaust system but now the top speed has dropped to 40-45mph. does anyone know what might be wrong.
kris, September 2012
well if the only thing you have changed since the power/speed loss is the exhaust then i would say the exhaust is blocked and not letting the gases flow freely

adam bike doctor( of milton keynes motorcycle centre), October 2012
link Click here to see other fixes for Jin Lun T13.