CArby upgrade

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Dude ur 25mm mikuni is just right for the 125

Put in a 105 mainjet with the needle in the middle position, and tune the air mix screw.

Best you will do.

Remember its just a pit bike.
 
28mm Is for modded engines. 26mm Is highest you want on a Stocker... I wouldnt even put the 26 on anything but a Jialing or Lifan Big Valve engine.
 
yes, as ry nos said. 105 main jet with your 25mm carby set. plus get rid of your stock 14 tooth front cog and fit a 17. available from esd.
 
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