Joyner JNSZ1100SV Owner's Manual page 62

3.3.3. Replacement of valve guide
3.3.3.1. Heat the cylinder cover to 80—100
degrees C with hot water
3.3.3.2. 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.
3.3.3.3. 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
model EF
item GL,ZL,RL,GS,ZS
IN
Height(mm)
EX
3.3.3.4. Use reamer to grind the inner
diameter to achieve the standard
value of the clearing.
3.3.4. Valve mating surface
3.3.4.1. Smear thin layer of red lead
powder on the valve-mating
surface. Do not turn the valve, and
gently drive it in. Check the mating
condition and the width of mating
line.
13.71±0.25
12.11±0.25
For EX
For IN