Checking The Cylinder - Yamaha KT100SEC Owner's Service Manual

CHECKING THE ENGINE PARTS

CHECKING THE CYLINDER

1. Inspect:
Exhaust port carbon deposition
●
Use a rounded scraper
CAUTION:
Avoid scratching the aluminum.
2. Inspect:
Cylinder wall
●
Score marks → Repair. Use #400∼600 grit
wet sandpaper.
Damage → Rebore or Replace.
3. Measure:
Cylinder wall wear
●
Measure the cylinder bore in parallel to and
at right angles to the crankshaft. Then, find
the average of the measurements.
Cylinder (Maximum
＝
wall wear Aa∼Cb)
Wear limit
0.015mm
Out of specification → Rebore or replace.
Cylinder bore gauge
90890-03017
4-10
ENG
.
(Minimum
−
Aa∼Cb)