Rato R80, Maintenance Manual, Page: 8 / 79

Part I Introduction
4
Cylinder Cylinder bore diameter 52-52.015mm 52.165
Cylinder
head cover
Warping -- 0.1
Piston
Outer diameter of piston skirt
Piston-cylinder clearance
Inner diameter of piston pinhole
Outer diameter of piston pin
Piston pin-piston pinhole clearance
51.975-51.985mm
0.015-0.04mm
10 .002-10.008mm
9.992-9.998mm
0.004-0.016mm
51.9
0.12
10.048
9.954
0.03
Piston ring
Piston ring side clearance: top
ring/ring 2
Oil ring
Piston ring closing clearance: top
ring/ring 2
Oil ring
Piston ring width: top ring/ring 2/oil
ring
0.03-0.07 mm
--
0.15-0.3mm
0.1-0.6mm
1.5mm
2.5mm
0.15
--
1
1
1.37
2.37
Connecting
rod
Inner diameter of small end
Inner diameter of big end
Big end oil film clearance
Small end side clearance
10.011-10.022mm
23.02-23.03mm
0.035-0.055mm
0.1-0.7mm
10.05
23.05
0.12
1.1
Crankshaft Outer diameter of main journal 22.975-22.985mm 22.945
Valve
Valve clearance
Outer diameter of
valve stem
Conduit inner
Intake
Exhaust
Intake
Exhaust
Intake/exhaust
0.15±0.02mm
0.20±0.02 mm
5.465-5.48mm
5.445-5.46mm
5.50-5.512mm
--
--
5.318
5.275
5.572