ZHEJIANG KAYO MOTOR CO., LTD.
Note
：
1. When assembling the timing bolts, do not drop the bolts into the cylinder.
2. Timing sprocket bolt torque: 7
～
11N•m.
6.
Adjust the clearance between the intake and exhaust valves, and turn the crankshaft counterclockwise for two
turns to align the O marking on the timing sprocket with the timing mark on the cylinder head.
1. There is a slight gap in the axial direction, and there is no gap between the top and bottom.
2. Check the valve clearance with a feeler gauge, and the value should be in the range of 0.01-0.03mm;
3. Tightening torque of adjusting nut: 8
～
12N•m.
7. Combine the Φ6×Φ13×2 aluminum washer with the hexagonal pan-head bolt GB5787 M6×110, insert the
cylinder head right cover hole into the cylinder head left cover (seal) threaded hole and tighten the bolts,
tightening torque: 8
～
12N•m.
8. Put the o-ring into the groove of the valve cover, and then install the valve cover on the cylinder head and
tighten it. Tightening torque: 8
～
12N•m.
Install the spark plug into the spark plug thread of the cylinder head and tighten it. Tightening torque: 10
～
12N•m.
CYLINDER BLOCK AND PISTON
Notice:
◆
Cylinder head lubricating oil is sent to the cylinder head through the oil hole next to the AB plug on the left body
of the engine. Before installing the cylinder block, make sure that the oil hole next to the AB plug on the left body
is unblocked, otherwise it is easy to cause engine damage.
◆
Do not allow dust or dust to penetrate into the crankcase.
MAIN PARAMETERS AND MAINTENANCE
STANDARD OF CYLINDER BLOCK
MAIN PARAMETERS AND MAINTENANCE STANDARD OF PISTON
No
Item
Standard
（
mm
）
Repair Limit Value
（
mm
）
NOTES
1
CYLINDER BLOCK
Cylinder hole diameter
Φ47~φ47.01
Φ47.018
Cylindricity
0.005
0.01
Flatness of cylinder surface
0.04
0.06
2
PISTON
Skirt diameter
，
H=7
Φ46.975~φ46.985
www.kayomoto.com
