![background image](/i/yamaha/160811/yamaha-yw50at-2001/h/yamaha-yw50at-2001-076.png)
4-5
ENG
CYLINDER AND PISTON INSPECTION
1. Eliminate:
8
Carbon deposits
Use a rounded scraper
1
.
2. Inspect:
8
Cylinder wall
Wear/Scratches
→
Rebore or replace.
3. Eliminate:
8
Carbon deposits
1
From the piston crown and ring
grooves.
4. Remove:
8
Score markes and lacquer deposits
From the sides of piston.
5. Inspect:
8
Piston wall
Wear/Scratches/Damage
→
Replace.
6. Measure:
8
Piston-to cylinder clearance
*************************************
Piston to cylinder clearance measurement
steps: First step:
8
Measure the cylinder bore “C” with a cylin-
der bore gauge.
NOTE:
Measure the cylinder bore “C” in parallel to and
at right angles to the crankshaft. Then, find the
average of the measurements.
CYLINDER AND PISTON INSPECTION
D
1
D
2
D
3
D
4
D
5
D
6
1
1
1