what jet should i use ???

i have my 139qmb 50cc bike with a large polini free flow air filter and stage 6 pipe and im currently running a 88# main jet which i think is too lean, stock was 78# and im stuck which jet to use, i hear like to use a 96# or up to 105# but im puzzled of what one would work best ?

please help.

sam

 

Buy a pack of jets stSrting at 90 and start high and work down.

 

Use the std airfilter and one size up on the main jet.