ZHEJIANG KAYO MOTOR CO., LTD.
www.kayomoto.com
68
Note
- Dismount the left and right crankcases before maintaining the crankcase, crankshaft, oil pump, main shaft and
auxiliary shaft.
- Remove cylinder head, cylinder, piston, clutch, oil pump, gear shift mechanism, balance gear, magneto and
adapter board before dismounting the crankcases.
Main parameters and maintenance standards
No. Item
Standard
Limits
Remark
1
Oil pump
Radial clearance between outer rotor and inner
rotor
0.1~0.15
0.20
Radial clearance between pump body and
outer rotor
0.15~0.21
0.25
End clearance between rotor and pump body
0.05~0.11
0.15
2
Crankshaft
Small head diameter of connecting rod
13.010~13.025
13.044
Big end side clearance of
connecting rod
axial direction
0.1~0.3
0.45
radial direction
0.004~0.012
0.05
Troubleshooting
No.
Faults
Possible causes
Remark
1
Crankshaft noise
The needle roller bearing oft the big end of the
connecting rod is worn
Connecting rod wear
crankshaft bearing is worn
2
Gearshift gear noise
Gearshift gear is worn
Gear shaft is worn
3
Low oil pressure or not pumping oil
Oil screen get blocked
Oil passage blocked
Oil pump parts are worn or damaged