Try a smaller size of main jet......they do not cost much.... drop down 1 or possibly 2 sizes and see what the plug colour/condition is looking like after the bike has been run under load [highish gear 3/4 throttle up an incline etc
do not do this ! the 2016 125 is already weak on the main jet,sherco team bikes are running a larger main than standard.
they are rich on the needle,they need to be used hard to keep them clear
you could drop the needle half a notch with a needle spacer/washer I think splat shop sells them
if your spark plug is sooty you need to drop the needle,one notch may be too much.you can buy a spacer from splat shop which makes half a notch adjustment possible,the mixture screw only affects the first part of throttle opening.
Undersize fork seals
in Gas Gas
Posted
0.2mm = 0.008" dont worry about it !