Suzuki DL650 Service Manual page 29

PERIODIC MAINTENANCE 2-9
Remove the generator cover plug
@
and timing inspection
plug
0.
Turn the crankshaft to set the No.1 (Front) cylinder at TDC of
compression stroke. (Align the "F I T line on the generator
rotor to the index mark of valve timing inspection hole and
also bring the camshafts to the position as shown in page
2-8.)
To inspect the No.1 (Front) cylinder valve clearance, use a
thickness gauge between the tappet and the cam. If the clear-
ance is out of specification, adjust it into the specified range.
09900-20803: Thickness gauge
Turn the crankshaft 270 degrees (314 turns) to set the No.2
(Rear) cylinder at TDC of compression stroke. (Align the
"R I T' line on the generator rotor to the index mark of valve
timing inspection hole and also bring the camshafts to the
position as shown in page 2-8.)
Inspect the No.2 (Rear) cylinder valve clearance as the same
manner of No.1 (Front) cylinder and adjust the clearance if
necessary.
-09900-20803: Thickness gauge