Honda ST50 Shop Manual page 127

Remove the cylinder head (page 15-16).
Remove the valve spring cotters, retainers,
springs and valves with a valve spring com·
presser.
Valve disassembly as shown.
INSPECTION
CAMSHAFT 0.0.
Measure the camshaft in two directions at
right angles to each other (both sides).
Standard
19.942- 19.955mm
f0.78441-0.78563 in)
29.942-29.955 mm
U.17882-1.17933 in)
CAMSHAFT END HOLE 1.0.
19.925mm
(0.78445in)
29.915mm
(Replace!
(1.17775inl
Measure the end hole in two directions at
right angles to each other (both ends).
L-END 20.000-20.020 mm 20.050 mm
!0.7874-0.78819inl (Replace!
/0.78937in)
A•END 29.000-29.024 mm 29.056 mm
11.14173-1.14267 in)
{Replace)
O.14393in)
cno
'82 ADDENDUM
VALVE STEMY'VAILVE
SEAL CAP
VA LVE
j
SPRINGS
/\ 40
VALVE SPRING
I..-.
~
0
1 \
COTTERS
~~
VALVE
~
VALVE STEM
•
SPRING SEAL
SEAT
.. '- 'VALVE
SPRING
RETAINER
125