Baja Motorsports WD400-U Operator's Manual - Manual (Page 51)

47
VALVE INSPECTION
Refer to maintenance schedule in this owner’s manual for valve adjustment
inspection intervals.
Valve clearance should be:
Intake: 0.002 inch (0.05 mm)
Exhaust: 0.003 inch (0.0762 mm)
The engine will make excess noise if the gap is too large in air valve. If
gap is too small valve operation will be hindered which could result in
valve malfunction and failure. Therefore, air valve gap must be checked
periodically.
If you have the proper tools and are mechanically proficient, instructions on
adjusting the valve clearance are given in the service manual. If assistance is
needed please contact Baja Inc. to find your local service center.