8-2
Cylinder Head / Valve
Torque Values
Cam Chain Tensioner Pivot Bolt 1.1kgf-m(11N.m)
Spark Plug 1.1kgf-m(11N.m)-Apply engine oil
Camshaft Holder 8mm nut 2.0kgf-m(20N.m)-Apply engine oil
Cam Chain Tensioner Mounting Bolt 1.2kgf-m(12N.m)
Cam Chain Tensioner Sealing Screw 0.4kgf-m(4N.m)
Cylinder Head Cover Bolt 1.0kgf-m(10N.m)
Crank Shaft Hole Cap 0.8kgf-m(8N.m)
Timing Hole Cap 0.6kgf-m(6N.m)
Tools
Special
Dowel Pin Puller Set
Sliding Shaft
Sliding Weight
Valve Guide Reamer
Valve Guide Driver
Common
Valve Spring Compressor
Valve Seat Cutter
Seat Cutter IN 35(23mm)
EX 35(20mm)
IN 45(24.5mm)
EX 45(24.5mm)
IN 60(22mm)
EX 60(22mm)
Cutter Holder 5mm
Iow compression
Valves
- Improper valve clearance adjustment
- Broken or damaged valve spring
- Incorrect valve timing
- Faulty valve seat adherence
Cylinder head
- Leaking or damaged head gasket
- Warped or cracked cylinder head
Cylinder and piston (Refer to section 9)
Excessice smoke from muffler
Worn valve guide or valve stem
Damaged valve stem seal
Worn and damaged piston ring
Incorrect idle speed
Compression is too low
Compression is too high
Excessive carbon build-up on piston or
combustion chamber
Excessive noise
Incorrect valve clearance adjustment
Sticking valve or broken valve spring
Worn or damaged camshaft
Worn or damaged rocker arm and rocker arm
shaft
Worn or damaged cam chain
Worn or damaged cam chain tensioner
Damaged cylinder head gasket
Improper spark plug installation
Troubleshooting
Cylinder head operation problem can be diagnosed by a compression test, or by tracing noises to the
topend with a sounding rod or stethoscope.
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