Mate its not hard! Do you know how to get to the jet? Start from the biggest jet an work your way down an check the colour of your plug
Id getstep by step pics but both my laptops are are broke :/its easy! Undo the metal clip that hold carb onto the rubber manifold pull the carb out. Get a flat head screw driver, there are 2 screws on the bottom on the carb, undo them. Some fuel will spill out but its ment to. Then look at the carb there will be a small jet an a bigger jet. Unscrew the big one then fit your new jet. Screw float. Bowl back on an refit the carb itll take 10 mins at most an youll laugh at how easy it is
I dont take the petrol pipe off :L i just leave the pipes and throttle in an can still remove the float easily