Cylinder Head / Valve; Troubleshooting; Cutter Holder 5Mm - DAELIM Daystar VL125E Service Manual

Cylinder Head / Valve

Torque Values
Cam Chain Tensioner Pivot Bolt
Spark Plug
Camshaft Holder 8mm nut
Cam Chain Tensioner Mounting Bolt
Cam Chain Tensioner Sealing Screw
Cylinder Head Cover Bolt
Crank Shaft Hole Cap
Timing Hole Cap
Tools
Special
Dowel Pin Puller Set
Sliding Shaft
Sliding Weight
Valve Guide Reamer
Valve Guide Driver

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.
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
9-2
1.1kgf-m(11N.m)
1.1kgf-m(11N.m)-Apply engine oil
2.0kgf-m(20N.m)-Apply engine oil
1.2kgf-m(12N.m)
0.4kgf-m(4N.m)
1.0kgf-m(10N.m)
0.8kgf-m(8N.m)
0.6kgf-m(6N.m)
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

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