DAELIM HISTORY 125 - SERVICE, Service Manual

Page: 96 / 208

TOOLS
VALVE GUIDE REAMER
VALVE GUIDE DRIVER
VALVE SPRING COMPRESSOR
VALVE SEAT CUTTER
SEAT CUTTER IN 37
°
(21.5mm)
EX 37
°
(18.5mm)
IN 45
°
(22.0mm)
EX 45
°
(22.0mm)
IN 55
°
(20.0mm)
EX 55
°
(20.0mm)
TROUBLESHOOTING
Enging top-end problems useally affect engine performance. These can be diagnosed by a compression or leak down test,
or by tracing noises to the top-end with a sounding rod or stethoscope.
9-2
CYLINDER HEAD / VALVES
Low comperssion
●
Valves
-Incorrect valve adjustment (see section 3)
-Burned or bent valves
-Incorrect valve timing
-Broken valve spring
-Uneven valve seating
●
Cylinder head
-Leaking or damage head gasket
-Warped or cracked cylinder head
●
Cylinder, piston (see section 10)
Excessive white smoke
●
Worn valve guide or valve stem
●
Damaged valve stem seal
●
Worn or damaged piston ring
Rough idle
●
Low cylinder compression
Compression too high
●
Excessive carbon build-up on piston or combustion
chamber
Excessive noise
●
Incorrect valve adjustment
●
Sticking valve or broken valve spring
●
Damaged or worn camshaft
●
Worn rocker arm and / or shaft
●
Loose or worn cam chain
●
Worn or damaged cam chain tensioner
●
Damaged cylinder head gasket
●
Incorrect spark plug installation