2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 65Get this manual
cleaner following manufacturer's instructions Correct fuel level in float chamber is vital toward maximum engine efficiencyTo check for correct float level proceed as follows: Remove float bowl and gasket from carburetorMake sure that float arm is symmetric, not distorted
With carburetor chamber up side down: Measure height between bowl seat and the top edge of float armUse float level gauge (PN JDG 529 035 520) Keep float level gauge perfectly vertical and in line with main jet holeEnsure that both float level gauge tips are properly positioned on carburetor body and that "L" arm is leaning on float while compressing valve springRefer to following photos for proper float level gauge positioningSet float height to 10 mm 0.5 mm