Yamaha RS90K, Service Manual

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9-4
SPEC
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINE
Model RS90/RS90R/RSG90/RS90M/RST90/RST90TF
Cylinder head:
Volume (with spark plug) 22.82 ~ 23.62 cm
3
(1.39 ~ 1.44 cu.in)
<Warpage limit> 0.10 mm (0.0039 in)
Lines indicate straight edge measurement.
Cylinder:
Material Aluminum alloy with dispersion coating
Bore size 79.000 ~ 79.010 mm (3.1102 ~ 3.1106 in)
<Taper limit> 0.050 mm (0.0020 in)
<Out of round> 0.050 mm (0.0020 in)
Camshaft:
Drive system Chain drive (right)
Camshaft cap inside diameter 24.500 ~ 24.521 mm (0.9646 ~ 0.9654 in)
Camshaft journal diameter 24.459 ~ 24.472 mm (0.9630 ~ 0.9635 in)
Camshaft-journal-to-camshaft-cap clear-
ance 0.028 ~ 0.062 mm (0.0011 ~ 0.0024 in)
Camshaft dimensions
Intake “A” 33.75 ~ 33.85 mm (1.3287 ~ 1.3327 in)
<Limit> 33.65 mm (1.3248 in)
“B” 24.95 ~ 25.05 mm (0.9823 ~ 0.9862 in)
<Limit> 24.85 mm (0.9783 in)
Exhaust “A” 33.75 ~ 33.85 mm (1.3287 ~ 1.3327 in)
<Limit> 33.65 mm (1.3248 in)
“B” 24.95 ~ 25.05 mm (0.9823 ~ 0.9862 in)
<Limit> 24.85 mm (0.9783 in)
Camshaft runout 0.03 mm (0.0012 in)
Timing chain:
Model/Number of links 98XTRH2005/140
Tensioning system Automatic
A
B