2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 33Get this manual
Maintenance and Lubrication: 6) Install the intake or exhaust camshaftsRefer to "Engine Top Side Assembly in Section 1D (Page 1D20)"7) Rotate the engine so that the tappet is depressed fullyThis will squeeze out oil trapped between the shim and the tappet that could cause an incorrect measurement, then check the clearance again to confirm that it is within the specified range8) After finishing the tappet clearance adjustment, reinstall the removed partsRefer to "Engine Top Side Assembly in Section 1D (Page 1D-20)" 0B-9
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3) After finishing the spark plug inspection, reinstall the removed partsSpark plug gap 1) Remove the spark plugRefer to "Spark Plug Cap and Spark Plug Removal and Installation in Section 1H (Page 1H-4)"2) Measure the spark plug gap using wire gaugeAdjust the spark plug gap if necessarySpark plug gap 0.7 0.8 mm (0.028 0.031 in)
Spark Plug Replacement
Replace spark plug Every 18 months
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