Troubleshooting - Honda Hawk GT NT650 1988 Service Manual

CYLINDER HEAD/VALVES
TORQUE VALUES
Cylinder head cover bolt
Camshaft holder 8 mm bolt
8 mm nut
6 mm bolt
Cylinder head 10 mm nut
8 mm bolt
8 mm nut
6 mm bolt
Camshaft sprocket bolt
Cam chain tensioner bolt
Oil pass pipe 7 mm bolt
8 mm bolt
TOOLS
Special
Valve guide reamer (IN)
Valve guide reamer (EX)
Valve guide driver attachment (IN)
Valve guide driver attachment (EX)
Common
Valve guide driver, 5.5 mm (IN)
Valve guide driver, 6.6 mm (EX)
Valve spring compressor
Valve seat cutter (Not available in U.S.A.)
Cutter holder IN 5.5 mm
EX 6.6 mm
Flat cutter IN 28 mm (32°)
EX 35 mm (32°)
Interior cutter IN 30 mm (60°)
EX 37.5 mm (60°)
Seat cutter IN 27.5 mm (45°)
EX 35 mm (45°)
TROUBLESHOOTI NG
10 N·m (1.0 kg-m, 7.2 ft-Ib)
23 N'm (2.3 kg-m, 17 ft-Ib)
23 N'm (2.3 kg-m, 17 ft-Ib)
10 N·m (1.0 kg-m, 7.2 ft-Ib)
48 N'm (4.8 kg-m, 35 ft-Ib)
23 N'm (2.3 kg-m, 17 ft-Ibl
23 N'm (2.3 kg-m, 17 ft-Ib)
10 N'm (1.0 kg-m, 7.2 ft-Ibl
23 N'm (2.3 kg-m, 17 ft-Ib)
10 N'm (1.0 kg-m, 7.2 ft-Ibl
10 N'm (1.0 kg-m, 7.2 ft-Ibl
23 N'm (2.3 kg-m, 17 ft-Ib)
07984-2000001 or 07984-200000B
J
U.S.A. only
07984-ZE20001 or 07984-ZE2000B
07943-MF50100
07943-MF50200
07742-0010100
07742-0010200 or 07942-6570100 U.S.A. only
07757-0010000 or 07957-3290001
07781-0010101
07781-0010201
07780-0012100
07780-0012300
07780-0014000
07780-0014100
07780-0010200
07780-0010400
Engine top-end problems are usually performance-related and can usually be diagonosed by a compression test.
Engine noises can usually be traced to the top-end with a sounding rod or stethoscope.
Uneven or low compression
Valves
- Incorrect valve adjustment
- Burned or bent valves
- Incorrect valve timing
- Broken valve spring
• Cylinder head
- Leaking or damaged head gasket
- Warped or cracked cylinder head
Cylinder and piston (Refer to Section 10)
High compression
Excessive carbon build-up on piston crown or combus-
tion chamber
9-2
Excessive noise
Incorrect valve adjustment
Sticking valve or broken valve spring
Damaged or worn rocker arm or camshaft
Loose or worn cam chain
Worn or damaged cam chain tensioner
• Worn cam sprocket teeth
Poor idling
• Compression too low