Yamaha RST90GTY, Service Manual

Page: 205 / 299

82
SPEC
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINE
Item Description
Cylinder head:
Volume (with spark plug) 25.21 ~ 26.01 cm
3
(1.54 ~ 1.59 cu.in)
<Warpage limit> 0.10 mm (0.0039 in)
Lines indicate straight edge measurement.
Cylinder:
Material Aluminum alloy with dispersion coating
Bore size 82.000 ~ 82.010 mm (3.2283 ~ 3.2287 in)
<Taper limit> 0.050 mm (0.0020 in)
<Out of round limit> 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 lobe dimensions
Intake “A” 33.750 ~ 33.850 mm (1.3287 ~ 1.3327 in)
<Limit> 33.650 mm (1.3248 in)
“B” 24.950 ~ 25.050 mm (0.9823 ~ 0.9862 in)
<Limit> 24.850 mm (0.9783 in)
Exhaust “A” 33.750 ~ 33.850 mm (1.3287 ~ 1.3327 in)
<Limit> 33.650 mm (1.3248 in)
“B” 24.950 ~ 25.050 mm (0.9823 ~ 0.9862 in)
<Limit> 24.850 mm (0.9783 in)
Camshaft runout 0.030 mm (0.0012 in)
Timing chain:
Model/Number of links 98XRH2010/140
Tensioning system Automatic
A
B