Piston Installation - KYMCO VENOX 250 Service Manual

7
. CRANKSHAFT/PISTON/CYLINDER
Insert each piston ring into the cylinder
bottom.
Use the piston head to push each piston
ring into the cylinder.
Measure the piston ring end gap.
Service Limit: 0.50mm
Measure the piston pin hole I.D.
Service Limit: 16.012mm replace if over
Measure the piston pin O.D.
Service Limit: 15.90mm replace if below
Measure the piston O.D.
Take measurement at 10mm from the
bottom and 90° to the piston pin hole.
Service Limit: 57.80mm replace if below
Measure the piston-to-piston pin clearance.
Service Limit: 0.01mm replace if over

PISTON INSTALLATION

Piston Ring Installation
First install the third ring side rail onto the
piston and then install the oil ring, side rail,
second ring and the top ring onto the piston.
Apply engine oil to each piston ring.
• Be careful not to damage or break the
piston and piston rings.
• All rings should be installed with the
English markings facing up.
• After the rings are installed, they
should rotate freely without sticking.
VENOX 250
7-6