Suzuki Jimny Service Manual page 570

3) Using micrometer, measure piston diameter.
Measurement position for piston diameter
"a" : 19.5 mm (0.77 in.)
4) Calculate cylinder bore diameter to be rebored as follows.
D = A + B – C
D : Cylinder bore diameter to be rebored.
A : Piston diameter as measured.
B : Piston clearance = 0.02 –0.04 mm (0.0008 – 0.0016 in.)
C : Allowance for honing = 0.02 mm (0.0008 in.)
5) Rebore and hone cylinder to calculated dimension.
NOTE:
Before reboring, install all main bearing caps in place
and tighten to specification to avoid distortion of bearing
bores.
6) Measure piston clearance after honing.
ENGINE MECHANICAL (M13 ENGINE) 6A1-89