Rato R160, Service Manual

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15
1-3-9 R420
Parts Item Standard Service limit
Engine
Maximum speed (No load)
Cylinder compression
3750-3850rpm
1.2Mpa （ 1400rpm ）
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Cylinder
head
Sleeve I.D 90-90.015mm 90.17mm
Cylinder
head
Warpage -- 0.10mm
Piston
Skirt O.D.
Piston-to-cylinder clearance
Piston pin bore I.D.
Piston pin O.D
Piston pin-to-piston pin bore clearance
89.96-89.97 mm
0.03-0.055 mm
20.002-20.008 mm
19.992-19.998 mm
0.004-0.016 mm
89.85mm
0.27mm
20.042mm
19.95mm
0.08mm
Piston rings
Ring side clearance: first/ second
Oil
Ring end gap: first/second
Oil
0.02-0.06mm
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0.2-0.4 mm
0.2-0.7 mm
0.15mm
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1.0mm
1.0mm
Seat width
Spring free length
EX
0.05-0.077mm
1.1mm
39.0mm
0.13mm
2.0mm
37.5mm
camshaft
Cam height
Journal O.D
IN
EX
33.6-33.8mm
32.90-33.10mm
15.966-15.984mm
33.58mm
32.88mm
15.92mm
Crankcase
cover
Camshaft holder I.D 16.0mm 16.048mm
Carburetor
Main jet
Float height
Pilot screw opening
0.92
13.2mm
1-7/8 turns
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Spark plug Gap 0.7-0.8mm --
Spark plug
cap
Resistance 7.5-12.5k Ω --
Ignition coil
Resistance
Air gap
Primary coil
Secondary coil
0.6-0.9 Ω
5.6-6.9k Ω
0.2-0.6mm
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