Cam Chain Tension Adjuster - Suzuki DR 125 Service Manual

2-6 PERIODIC MAINTENANCE
NOTE:
* The piston must be at (TDC) on the compression stroke in
order to check the valve clearance or to adjust valve clear-
ance.
* The clearance specification is for COLD state.
* To turn the crankshaft for clearance checking, rotate in the nor-
mal running direction. The spark plug should be removed.
• Turn crankshaft to bring the "TDC" line on the rotor to the
index mark A on the generator cover.
• Insert a thickness gauge between the valve stem end and the
adjusting screw on the rocker arm.
If the clearance is out of specification, bring it into the speci-
fied range.
# 09900-20803: Thickness gauge
09917-13210: Valve clearance adjusting driver
$ Valve clearance (when cold):
IN.: 0.08 – 0.13 mm (0.003 – 0.005 in)
EX.: 0.13 – 0.18 mm (0.005 – 0.007 in)

CAM CHAIN TENSION ADJUSTER

Inspect initially at 1 month and every 6 months there-
after.
The cam chain is maintained at the proper tension by a manually
adjusted cam chain tension adjuster. To prevent chain noise, the
cam chain tension adjuster must be adjusted at the intervals
listed abobe. The procedure for adjusting the cam chain tension
adjuster is as follows:
• Loosen the lock nut 1 on the cam chain tension adjuster and
back out the set screw 2 one turn. This will allow a spring to
push the push rod firmly on to the cam chain tensioner, and
provide proper operating chain tension.
• Tighten the set screw 2 to lock the push rod in position and
tighten the lock nut 1 to secure the set screw 2.