KAYO MOTOR FOX 70, Service Manual

Page: 86 / 105

ZHEJIANG KAYO MOTOR CO., LTD.
WWW.RIDEKAYO.COM
86
Valve oil seal The edge of valve oil seal
is worn, age or damage.
Thick blue and white fume form
the exhaust muffler pipe
Replace the
complete set of
valve oil seal
Camshaft
The cam is cover worn Insufficient engine output Replace the camshaft
The bearing of the camshaft
is over worn or damaged
The axial or radial
clearance of the bearing is
too wide. Ineffective
bearing swiveling or
abnormal sound during
swiveling.
轴承的轴向或径
向间隙太宽。旋转时轴承
旋转不正常或声音异常
Abnormal sound heard during
camshaft transmission.
Replace he camshaft
Rocker arm The working surface is
scratched or over worn
Valve striking sound
Replace the rocker
arm
The rocker arm shaft hole
is over worn
Big gap between the rocker
arm and rocker arm shaft
Valve striking sound
Replace the rocker
arm
The rocker arm shaft is over
worn
Big gap between the rocker
arm and rocker arm shaft
Valve striking sound
Replace the rocker
arm shaft
Valve
The valve clearance is too
small
The valve is impossible to
close completely
The engine starts hard or fails to
start. Insufficient engine output;
Engine speed changes during idle
run
Readjust the valve
clearance to
0.05~0.06mm
The valve clearance is too
big
Valve striking sound
Readjust the valve
clearance to
0.05~0.06mm
Carbon deposit on
working surface
It is impossible to fit the
valve and the valve seat
tightly.
The engine starts hard or fails to
start. Insufficient engine output;
Engine speed changes during idle
run
Remove the carbon
deposit