Yamaha WaveRunner GP1300R, Service Manual

Page: 258 / 577

5-34
E
POWR
PISTONS
4. Calculate:
• Piston-to-cylinder clearance
Out of specification
→
Replace the pis-
ton, piston rings, and cylinder as a set.
Cylinder and piston combination
Select the appropriate piston to match the cyl-
inder size from the table as follows.
NOTE:
New cylinder bore size = 84.000 +
a
/1,000
Example:
a
= 12
→
84.012 mm.
PISTON
CLEARANCE
=
CYLINDER
BORE
–
PISTON
DIAMETER
Piston-to-cylinder clearance:
0.100–0.105 mm
(0.0039–0.0041 in)
Cylinder size
indication
a
Piston color mark
00–05 Red
06–10 Orange
11–15 Green
16–18 Purple
Piston ring inspection
1. Measure:
• Side clearance
(using a thickness gauge
1
)
Out of specification
→
Replace the pis-
ton and piston rings as a set.
Side clearance:
0.020–0.070 mm
(0.0008–0.0028 in)