Choose your country
We work in partnership with many official Kymco dealers around the world.
You can select the country of your choice from the list below, whatever your choice, we can deliver worldwide!
7. CYLINDER HEAD/VALVES MOVIE SYSTEM
TORQUE VALUES
Cylinder head nut 2.0kg-m Apply engine oil to threads
Valve clearance adjusting nut 0.9kg-m Apply engine oil to threads
Stud bolt 0.9~1.1kg-m
SPECIAL TOOLS
Valve spring compressor
Valve seat cutter, 24.5mm 45° IN/EX
Valve seat cutter, 25mm Plane cutter 32° IN
Valve seat cutter, 22mm Plane cutter 32° EX
Valve seat cutter, 26mm Plane cutter 60° IN/EX
Cutter clip, 5mm
Valve spring compressor attachment
Valve wrench
Valve guide driver
Valve guide reamer
TROUBLESHOOTING
· The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
top-end noises.
Poor performance at idle speed White smoke from exhaust muffler
· Compression too low · Worn valve stem or valve guide
· Damaged valve stem seal
Compression too low
· Incorrect valve clearance adjustment Abnormal noise
· Burned or bend valves · Incorrect valve clearance adjustment
· Incorrect valve timing · Sticking valve or broken valve spring
· Broken valve spring · Damaged or worn camshaft
· Poor valve and seat contact · Worn cam chain guide
· Leaking cylinder head gasket · Worn camshaft and rocker arm
· Warped or cracked cylinder head
· Poorly installed spark plug
Compression too high
· Excessive carbon build-up in combustion
chamber
7-2