KAYO MOTOR FOX 70, Service Manual

Page: 76 / 105

ZHEJIANG KAYO MOTOR CO., LTD.
WWW.RIDEKAYO.COM
76
Crank pin
The crank pin is over
worn
Radial and axes gap of the
connecting rod big end is too large
Striking sound of the big-end
bearing; Striking sound of the
cylinder
Replace the
crankshaft
connecting rod
Bearing
The big-end needle
bearing is over worn
Radial and axes gap of the
connecting rod big end is too large
Striking sound of the big-end
bearing; and of the cylinder
Replace the
crankshaft
connecting rod
The crankshaft bearing is
over worn or damaged
Abnormal sound during the
crankshaft bearing transmission
Replace the
crankshaft bearing
Piston ring
set
活塞环
总成
The piston ring is
fractured
The piston ring is fractured The engine starts hard or fails to
start. Insufficient engine output;
Thick blue and white fume form
the exhaust muffler pipe
发动机启动很难或无法启动。
发动机输出不足
;
厚厚的蓝色和
白色烟雾充满消声管
Replace the piston
ring set
The piston ring is over
worn
The piston ring opening gap or the
side gap is too wide
Insufficient elasticity of
piston ring
It is impossible to tight the piston
ring and the cylinder properly
Improper fixing The piston ring gap is not staggered
Thick blue and white fume form
the exhaust muffler pipe
Refixing the piston
ring set
Piston pin
The piston pin is over
worn
The fitting clearance between the
piston pin and the hole is too wide
Striking sound of the piston pin
and of the cylinder
Replace the piston
pin
Connecting
rod
The connecting rod
small-end hole is over
worn
The fitting clearance between the
piston pin and the small-end is too
wide
Striking sound of the piston and
of the cylinder
Replace the
connecting rod
The connecting rod is
crooked or twisted
The connecting rod is crooked or
twisted
Striking sound of the cylinder
Replace the
connecting rod
The big-end hole is over
worn
Radial and axes gap of the
connecting rod big end is too large
Striking sound of the big-end
bearing and of the cylinder
Replace the
connecting rod
Timing
sprocket
The gear is over worn of
damage
Abnormal sound during sprocket
driving
Replace the timing
sprocket