Cylinder Head/Valves Troubleshooting - Honda XL200 2001 Shop Manual

CYLINDER HEAD/VALVES
TORQUE VALUES
Valve adjusting hole cap
Valve adjusting screw lock nut
Cylinder head cover 8 mm cap nut
Cylinder head cover 6 mm socket bolt
Cam sprocket bolt
Cam chain tensioner lifter mounting bolt
Cam chain tensioner lifter sealing screw
Timing hole cap
Crankshaft hole cap
TOOLS
Valve guide reamer, 5.485 mm
Valve guide driver, 5,5 mm
Valve spring compressor
TROUBLESHOOTING
• Engine top-end problems usually 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.
• If the performance is poor at low speeds, check for white smoke in the crankcase breather tube. If the tube is smoky, check
for a seized piston ring.
Compression too low, hard starting or poor per-
formance at low speed
• Valves
– Incorrect valve adjustment
– Burned or bent valves
– Incorrect valve timing
– Broken valve spring
– Weak valve spring
• Cylinder head
– Leaking or damaged cylinder head gasket
– Warped or cracked cylinder head
• Faulty cylinder/piston (Section 7)
Compression too high, overheating or knocking
• Excessive carbon build-up in cylinder or on top of
piston
6 -2
15 N.m (1,5 kg.m, 11 ft-lb)
14 N.m (1,4 kg.m, 10 ft-lb)
27 N.m (2,7 kg.m, 20 ft-lb)
10 N.m (1,0 kg.m, 7 ft-lb)
12 N.m (1,2 kg.m, 9 ft-lb)
12 N.m (1,2 kg.m, 9 ft-lb)
4 N.m (0,4 kg.m, 3 ft-lb)
6 N.m (0,6 kg.m. 4 ft-lb)
8 N.m (0,8 kg.m, 6 ft-lb)
07984-0980001
07742-0010100BR
07757-0010000BR
Excessive smoke
• Worn valve stem or valve guide
• Damaged stem seal
• Faulty cylinder or piston (Section 7)
Excessive noise
• Incorrect valve clearance
• Sticking valve or broken valve spring
• Worn or damaged push rod
• Loose or worn cam chain
• Worn or damaged cam chain tensioner
• Worn cam sprocket teeth
• Worn rocker arm and/or shaft
• Faulty cylinder or piston (Section 7)
Rough idle
• Low cylinder compression
• Intake air leak
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