Cylinder/Piston Installation - Honda XR80R Service Manual

CYLINDER/PISTON
Do
not dama(}8
roo Remove the piston rings.
pisron rings during
removal.
CYLINDER/PISTON INSPECTION
8-4
CYLINDER
Inspect t he cyli nder bore for wear or dllmage.
Measure the cylinder
1.0. in X and Y
axis
at
th ree
levels.
Ta ke the max imum reading to determine I he
cy linder wear.
SERVICE UMIT:
XR100R: S3.1 mm 12.09 in)
XR80R: 47.6 mm (1.87 inl
Calculate the piston-to-cylinder clearance.
T a ke
a
ma ~i mum
readi ng to deter m in e t he
clearance.
Relerto page 8·5 for measurement of Ihe piston 0.0.
SERVICE UMIT: 0.10 mm 10.004 In)
Ca lculate the taper and OUI of round at three levels
i n X and Y
a~is .
Take the maximum reading to
determine them .
SERVICE UMIT:
Taper: 0.10 rnm (0.004 in)
Out of round: 0.10 rnm 10.004 in)
The cyl inder must be rebored and an OVerSile piston
fitted if the service limits /Ire
e~ceeded.
The followi ng overs ile pistons /Ire avaiab le:
XRIDOR;
0.25 mm 10.010 in)
0.50 mm 10.020 inl
XR80R ·
0.25 mm (0.0 10 in)
0.50 mm 10.020 in)
0.75 mm 10.030 in)
1.00
mm (0.039 in)
The pis t on·lo -cylinder clearance for the overSize
piston must be: 0.010 - 0.040 mm 10.0004 _ 0.0016
in)
[(\Spect the lap of the C'; linder la, "",upage.
SERVICE LIMIT: 0.10 rnm 10.004 in)
,"SODNR ING
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TOP
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M IDDLE
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BOTTOM