Cylinder Head/Cylinder/Piston Troubleshooting; Cylinder Head/Cylinder/Piston Torque Values - Honda CR 125R 2002 Sevice Manual

CYLINDER HEAD/CYLINDER/PISTON
TORQUE VALUES
Cylinder head nut
Cylinder mounting nut
Cylinder stud bolt
Exhaust pipe joint boll
Cylinder sealing bolt
Engine hanger plale bolt
AC valve cover bolt
AC valve cover screw
TROUBLESHOOTING
27 N· m (2.8 kgf'm, 20 fbf·h)
27 N'm 12.8 kgf'm, 20 fbf·tO
12 N' m (1.2 kgf· m, 9 Ibfoft)
12 N ' m (1.2 kgf· m. 9 Ibfoft)
10 N·m (1.0 kgf·m. 7 IbHt)
34 N' m (3.5 kgf' m, 25 Ibfoftl
12 N' m (1.2 kg f' m, 9 Ibf·ft)
3 N' m (0.3 kgf'm, 2.2 Ibfoft)
Engine lop-end problems usually affect engine performance. These problems can be diagnosed by a compression test or
by tracing engine noises to the top-end with a soun ding rod stethoscope.
If the performance is poor at low speeds, check fo r white smoke in the crankcase breathe r tube. If the tube is smoky, check
for a seized piston ring.
Compression too low, hard starting or poo r performance at
low speed
Blown cylinder head gasket
Loose spark plug
Worn, stuck or broken piston ring
Worn or damaged cylinder and piston
Faulty reed valve
Worn crankshaft seals
Compressi on too high, overheati ng or knocking
Excessive carbon build-up on top of piston or in combustion
chamber
Abn ormal noise - piston
• Worn or cracked piston
• Worn cylinder and piston
Worn piston pin or piston pin hole
• Worn connecting rod small end bearing
7-2
Abnormal no ise - piston ring
Worn, stuck or broken piston ring
• Worn or damaged cylinder
Contaminated coolant
• Leaking cylinder head gasket