Camshaft - Suzuki DR 125 Service Manual

CAMSHAFT

CAMSHAFT INSPECTION
If the engine produces abnormal noises, vibration or lacks
power, a camshaft may be distorted or worn to the service limit.
The camshaft runout should be checked. Also, check the cams
and journals for wear or damage.
CAM WEAR
Worn-down cams are often the cause of mistimed valve opera-
tion resulting in reduced power output.
Measure the cam height H using the micrometer. Replace a
camshaft if the cams are worn to the service limit.
$ Cam height H
Service Limit (IN & EX): 32.83 mm (1.293 in)
& 09900-20202: Micrometer (25 – 50 mm)
CAMSHAF T JOURNAL WEAR
Determine whether or not each journal is worn down to the limit
by measuring the oil clearance with the camshaft installed in
place. Measure the clearance using the plastigauge 1.
& 09900-22301: Plastigauge
09900-22302: Plastigauge
NOTE:
Install the cylinder head cover to its original position.
• Tighten the cylinder head cover bolts evenly and diagonally to
the specified torque.
" Cylinder head cover bolt: 10 N·m (1.0 kgf-m, 7.0lb-ft)
NOTE:
Do not rotate the camshaft with the plastigauge in place.
Remove the cylinder head cover and measure the width of the
compressed plastigauge using the envelope scale. This mea-
surement should be taken at the widest part of the compressed
plastigauge.
$ Camshaft journal oil clearance
Service Limit: 0.150 mm (0.0059 in)
ENGINE 3-29