Joyner JNSZ1100SVB, Owner'S Manual, Page: 70 / 228

shown as the figure. Work out the
clearance of the final torn and worn section
1.10.3. Replacement of valve guide
1.10.3.1. Heat the cylinder cover to 80
—
100 degrees C with hot water
1.10.3.2. Use special tools to drive in the
valve-guiding pipe to the position
as shown in the right figure from
the side of the combustion
chamber.
Attention The removed guiding pipe
cannot be used repeatedly. The air intake
and exhaust valve guiding pipes should
not be mixed up in installation.
1.10.3.3. Use special tools to drive in the
new valve-guiding pipe to the
position as shown in the right
figure.
Attention In the process of driving in the
guiding pipe into the cylinder cover, the
operation should be carried out slowly until
the pipe gets to the proper position. No
excessive driving should be exerted. Pay
attention to the specifications in the
operation. Driving in depth of throttle
guiding pipe
1.10.3.4. Use
reamer to grind the inner
item standard limit
Valve guide
Inside diameter(mm)
φ 5.0 —
Valve stem outside
diameter (mm)
φ
5.0 —
Spacing
(mm)
IN
0.056 ～
0.020mm
0.07
EX
0.066
～
0.030mm
0.08
model EF
item GL,ZL,RL,GS,ZS
Height(mm)
IN 13.71
±
0.25
EX 12.11 ± 0.25
For IN
For EX