Suzuki Wagon R Manual page 3154

Sensor plate
Check sensor plate for crack or damage. If malcondition is found,
replace it.
Cylinder block
Distortion of gasketed surface
Using straightedge and thickness gauge, check gasketed surface
for distortion and, if flatness exceeds its limit, correct it.
Cylinder block flatness
Limit: 0.03 mm (0.0012 in.)
Honing or reboring cylinders
1) When any cylinder needs reboring, all other cylinders must
also be rebored at the same time.
2) Select oversized piston according to amount of cylinder
wear.
Oversize piston diameter
Size
Oversize 0.50 78.453 – 78.468 mm (3.0887 – 3.0892 in.)
3) Using micrometer, measure piston diameter.
Measurement position for piston diameter
"a": 19.5 mm (0.77 in.)
4) Rebore and hone cylinder to the following dimension.
Cylinder bore diameter to be rebored
Oversize 0.50: 78.500 – 78.514 mm (3.0906 – 3.0911 in.)
NOTE:
Before reboring, install all main bearing caps in place
and tighten to specification to avoid distortion of bearing
bores.
5) Measure piston clearance after honing.
Piston clearance: 0.032 – 0.061 mm (0.0013 – 0.0024 in.)
ENGINE MECHANICAL (M13 ENGINE) 6A2-91
Piston diameter