Lol, sorry haven't got to check this for a while, so the main jet is the one in the middle when you take the bowl off right? Its also the one the needle slides into? I will drain that mix before my next rise,. And I bought it from the owner of a dirtbike shop, id hope he would have set it up to par.. what size should the main jet be for 32:1 ?
If you change from 50:1 to 32:1 there will be less fuel in the pre-mix, so the air fuel ratio will be gas lean..
More oil = less gas = lean mix.
If the motor has been jetted correctly for 50:1 then you need at least one size bigger main jet, if you change to 32:1.
Plug chop to confirm.