2003 Kawasaki KLF250 Service Manual., Page 109Get this manual
ENGINE RIGHT SIDE 5-13 Primary Reduction
Gear Backlash
Remove the right engine cover (see Right Engine Cover Removal)dial gauge the and Set the gear [B][A] againstforthteeth on one gear,other move back and while holding the
gear [C] steadyThe difference between the highest and the lowest gauge readings is the amount of backlashGear Backlash Standard: Service Limit: 0.02 0.11 mm (0.0008 0.0043 in 0.14 mm (0.0055 in
If the amount of backlash exceeds the service limit, replace both gears
Primary GearCrankshaft Wear