CF MOTO CF125T-19 2003, Service Manual

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12 Crankcase crankshaft piston
12
12-7
Check piston ring for wear or scrapes.
Assemble piston ring into the right groove, and then press till it
reaches the position close to the side surface of piston.
Measure the clearance between piston ring and groove with a
plug ruler.
Service limit: Top ring: 0.07 mm
2nd ring: 0.07mm
Place piston ring horizontally into bottom of cylinder in the
direction of piston top.
Measure piston ring gap with plug ruler.
Service Limit: Top ring: 0.45 mm
2nd ring: 0.45mm
Oil ring (side rails):0.9mm
Assemble piston
Caution
Do not damage piston ring or piston when assembling
piston.
Assemble piston ring onto piston, with marks upwards.
Caution
• Top ring and 2
nd
cannot be interchanged.
• Make sure to install piston rings so that the
manufacturer ’ s marks or numbers are located on the up-
per side of the rings.
• Keep the piston ring gaps staggered at the interval of
120
°
After assembly, confirm piston rings can turn smoothly in
groove.
Apply engine oil to small end of connecting rod, piston pin
and its hole. Install piston and make sure that the
“ IN ” mark
on piston is in the direction of the air inlet side when installing
the crankshaft to the engine.
Install new piston pin retainer.
* Caution
• Piston pin retainer must be firmly mounted into groove.
• Retainer end gap should be avoid from the cut of piston.