aerox problem

hi i have a yamaha aerox 50 on a 02 plate it has a power pipe it is a yasuni end can with a techno expansion chamber ive been told its been de restricted and being up jetted but it only does 38 mph tops.
is this correct ?

 

check your variator for any restrictions

 

what shall i check for?
im new to this

 

well, since ure new im gona assume u dont have the tools for this. u take off ur tranny case cover and the pully on the left u undo. but ull need a special took to take it off or an impact gun. when its off behind the belt there will be a small washer, u remove this and assemble everything back together.
theres loads of videos on utube. variator restrictor

 

yes that has already being taken out it has standard rollers in and a size 100 jet?
is this why?

 

....why is there a 100 jet in there.. u only upjet a slight bit
order a box of jets from like 60-80 or whatever they do
and a box of rollers. u drop a gram in rollers.