GR1600EC, WSM ENGINE
1-S56
Correcting Cylinder
1. When the cylinder is worn beyond the allowable limit, bore and
hone it to the specified dimension.
2. Replace the piston and piston rings with oversize ones.
A When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
(6) Oil Pump
Rotor Lobe Clearance
1. Measure the clearance between lobes of the inner rotor and
the outer rotor with a thickness gauge.
2. If the clearance exceeds the factory specifications, replace the
oil pump rotor assembly.
Clearance between Outer Rotor and Pump Body
1. Measure the clearance between the outer rotor and the pump
body with a thickness gauge.
2. If the clearance exceeds the factory specifications, replace the
oil pump rotor assembly.
Cylinder I.D.
[Oversize]
Factory spec.
67.250 to 67.269 mm
2.64764 to 2.64839 in.
Allowable limit
67.419 mm
2.65429 in.
Finishing
Horn to 1.2 to 2.0 m Rmax.
(0.000047 to 0.000079 in. Rmax.)
Oversize Part Name Code Number Marking
0.25 mm
0.0098 in.
Piston 16851-21900 025
Piston ring assembly 16851-21090 025
(1) Cylinder I.D. (2) Cylinder I.D. [Oversize]
[Before Correction]
0000009528E
Rotor lobe clearance Factory spec.
0.03 to 0.14 mm
0.0012 to 0.0055 in.
0000000915E
Clearance between
outer rotor and pump
body
Factory spec.
0.07 to 0.15 mm
0.0028 to 0.0059 in.
0000000916E
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