Disassembling The Cylinder Body; Checking The Piston Diameter - Yamaha F2.5A Service Manual

Disassembling the cylinder body

1. Remove the crankcase cover bolts in the
sequence shown.
3
8
4
5
2. Remove the crankcase.
NOTE:
Insert a flat head screwdriver between the
tab of the crankcase and the tab of the cylin-
der block to pry open the two parts.
3. Remove the camshaft 1, and then
remove the valve lifters 2.
69M3E11
2
1
7
6
S69M5510
S69M5520
4. Remove the connecting rod bolts and the
connecting rod cap, and then remove the
connecting rod and piston assembly.
5. Remove the clips 3 with pliers, and then
remove the piston.
6. Remove the washer 4 and crankshaft
5, and then remove the oil splasher gear
6.
5
4

Checking the piston diameter

1. Measure the piston outside diameter at
the specified measuring point. Replace if
out of specification.
Piston diameter a:
53.950–53.965 mm
(2.1240–2.1246 in)
Measuring point b: 0 mm (0 in)
Cylinder block
6
S69M5550
5-24
1
2
3
4
5
6
7
8
9