Yamaha RS90GTZ Service Manual page 295

CONNECTING RODS AND PISTONS
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8. Measure:
• Piston pin bore inside diameter
Out of specification → Replace the piston.
Piston pin bore inside diameter:
19.004 ~ 19.015 mm
(0.7482 ~ 0.7486 in)
<Limit>: 19.045 mm (0.7498 in)
9. Calculate:
• Piston-pin-to-piston-pin-bore clearance
Out of specification → Replace the piston
pin and piston as a set.
Piston-pin-to-piston-pin-bore clearance =
Piston pin bore inside diameter –
Piston pin outside diameter
Piston-pin-to-piston-pin-bore
clearance:
0.004 ~ 0.024 mm
(0.0002 ~ 0.0009 in)
<Limit>: 0.074 mm (0.0029 in)
10.Measure:
• Crankshaft-pin-to-big-end-bearing
ance
Out of specification → Replace the big end
bearings.
Crankshaft-pin-to-big-end-
bearing clearance:
0.033 ~ 0.050 mm
(0.0013 ~ 0.0020 in)
ENG
clear-