There is two ways to measure this, just assuming for your carb it is the same as for the XT600:
1. Support the bike so that is vertical, on a flat surface. Jack up the front wheel so that the mating surface carb / bowl is horizontal. There should be a little hose connection on the bottom of the float bowl. Put on a plastic transparent hose. About 15 centimeters from the end you slip on the bowl you should put two lines on the hose, 6 mm apart. Other end of hose to be fixed temporarily upwards. Unscrew the little drain screw in the bowl, from the left side. Now fuel flows into the hose. Start bike and let run for 4 minutes, idle. Matching the upper line on the hose with the mating face bowl / carb the fuel level in the hose, being the same as in the bowl, should match the lowest line on the hose. Level may be not more than 2 mm lower than the lower line. The 6-8 mm is a XT600 measurement however.
2. Remove carb from bike. Remove bowl. Turn float upwards so that it rests on the needle. Measure distance from mating face to lower side of float. Fot the XT6 this should be 25 - 27 mm.
Also: check colour of spark plug, is it very white? Any air leakage somewhere in the inlet tracts? Any mods to the intake system?
Auke
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