Cylinder Removal - KYMCO NEXXON 50 Service Manual

7
. CYLINDER/PISTON

CYLINDER REMOVAL

Remove the cylinder head.
Remove the cam chain guide roller.
Remove the cylinder by removing the
cylinder bolt.
Remove all gasket material from the cylinder
surface.
Remove the gasket and dowel pins.
CYLINDER INSPECTION
Inspect the cylinder bore for wear or damage.
Measure the cylinder I.D. at three levels of
top, middle and bottom at 90° to the piston
pin (in both X and Y directions).
Service Limit: 52.4mm repair or replace if
over
52.4mm repair or replace if below
Measure the cylinder-to-piston clearance.
Service Limit: 0.35mm repair or replace if
over
The true roundness is the difference between
the values measured in X and Y directions.
The cylindricity (difference between the
values measured at the three levels) is subject
to the maximum value calculated.
Service Limits:
True Roundness: 0.05mm repair or replace
if over
Cylindricity: 0.05mm repair or replace if over
7-3
Guide Roller
Dowel Pins
Top
Middle
Bottom
NEXXON 50
Guide Roller Bolt
Cylinder Bolt
Gasket