Honda TRX400EX FOURTRAX 1999, Service Manual

Page: 88 / 263

CYLINDER
TORQUE VALUES
Upper engine hanger nut
Cylinder head nut
Cam sprocket bolt
Cam chain tensioner plug
Rocker arm shaft
Sub-rocker arm shaft
Cylinder head cover bolt
Spark plug
TOOLS
Valve spring compressor
Valve guide driver, 5.5 mm
Valve guide reamer,
5.5 mm
Valve seat cutter, 35 m m
(IN
45")
Valve seat cutter, 29 (EX
Flat cutter, 35 m m (IN 32")
Flat cutter, 30 mm (EX 32")
Interior cutter, 30 m m
Compression gauge attachment
Cutter holder,
5.5 m m
54 (5.5 kgfm, 40
20 (2.0 14 Apply locking agent to the threads
4 (0.4 kgfm, 2.9
27 (2.8 kgfm, 20 Apply locking agent to the threads
27 (2.8 kgfm, 20 Apply locking agent t o the threads
26 (2.7 kgfm, 20
18 (1.8 kgfm, 13
44 (4.5 kgfm, 33 Apply oil to the threads and seating surface
07757 -0010000
07742- 0010100
07984
-
2000001 or 07984
-
only)
07780-0010300
07780-0012300
07780-0012200
07780
-
001
4000
07908
-
07781-0010101
or equivalent commercially available in
TROUBLESHOOTING
Engine top-end problems usually affect engine performance. These can be diagnosed by a compression test, or by tracing
top-end noise with
a sounding rod or stethoscope.
If the performance
i s poor at low speeds, check for a white smoke in the crankcase breather tube. If the tube is
smoky.
check for sized piston ring (section
Compression
too
low, hard starting
or
poor performance
a t low speed
Valves
-
Incorrect valve adjustment
-
Burned or bent valves
-
Incorrect valve timing
-Broken valve spring
-Uneven valve seating
-Valve stuck open
-
Leaking or damaged cylinder head gasket
- Warped or cracked cylinder head
-
Loose spark plug
Cylinder head
Cylinderlpiston (section
Compression
too
high
Excessive carbon build-up
on
piston head or combus-
tion chamber
Worn or damaged decornpressor system
Excessive smoke
Worn valve stem or valve guide
Damaged stem seal
Cylinderlpiston problem (section
Excessive noise
Incorrect valve clearance
Sticking valve or broken valve spring
Excessive worn valve seat
Worn or damaged camshaft
Worn or damaged rocker arm shaft
Worn rocker arm follower or valve stem end
Worn cam chain
Worn or damaged cam chain tensioner
Worn cam sprocket teeth
Cylinderlpiston problem (section
Rough idle
Low cylinder compression
7-2