- Piston ring side clearance
Out of specification → Replace the piston and piston rings as a set.
Note: Before measuring the piston ring side clearance, eliminate any carbon deposits from the piston ring grooves and piston rings.
Piston ring side clearance:
- Top ring: 0.030-0.065 mm (0.00120.0026 in)
- Limit: 0.115 mm (0.0045 in)
- 2nd ring: 0.020-0.055 mm (0.00080.0022 in)
- Limit: 0.115 mm (0.0045 in)
![](https://motoinstruction.ru/img/yamaha/3/111957.jpg)
2. Install:
- Piston ring (into the cylinder)
Note: Level the piston ring into the cylinder with the piston crown.
![](https://motoinstruction.ru/img/yamaha/3/111958.jpg)
5 mm (0.20 in) «a»
3. Measure:
- Piston ring end gap
Out of specification → Replace the piston ring.
Note: The oil ring expander spacer’s end gap cannot be measured. If the oil ring rail’s gap is excessive, replace all three piston rings.
Piston ring end gap:
- Top ring: 0.15-0.25 mm (0.0059-0.0098 in)
- Limit: 0.50 mm (0.0197 in)
- 2nd ring: 0.30-0.45 mm (0.0118-0.0177 in)
- Limit: 0.80 mm (0.0315 in)
- Oil ring: 0.10-0.40 mm (0.0039-0.0157 in)