Sym PA12B User Manual

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7. Cylinder Head / Valve
7-10
Valve Guide Replacement
Heat the cylinder head with heated plate or
toaster till the temperature reaches 100~150
℃.
Caution
y Do not use flame to heat the cylinder
head directly. Otherwise, the cylinder
head will be deformed.
z Wear on a pair of heat-isolation glove to
protect your hands when operating.
Hold the cylinder head, and then press out old
valve guide from combustion chamber side.
Tool: Valve guide driver: 5.0 mm
Caution
y Check if new valve guide is deformed
when pressed it in.
z When pressing in the new valve guide,
cylinder head still have to maintain
100~150℃.
Adjust the valve guide driver and let valve
guide height be 13 mm.
Press in new valve guide from rocker arm
side.
Tool: Valve guide driver: 5.0 mm
Wait until cylinder head is cooled down to
room temperature, and then fix the new valve
guide with reamer.
Caution
y Use cutting oil when correcting valve
guide with a reamer.
z Turn the reamer in same direction when
it be inserted or rotated.
Valve Guide driver
13 mm
Valve Guide driver
(0.15in)
5.0mm
Valve Guide Reamer 5.0mm
Correct the valve seat, and clean up all metal
residues from cylinder head.
Special tool：Valve Guide Reamer 5.0mm

Sym PA12B Specifications

General

Brand	Sym
Model	PA12B
Category	Motorcycle
Language	English