Cylinder Compression; Camshaft Removal; Compression Pressure - Honda 2000 XR50R Service Manual

CYLINDER COMPRESSION
Warm up the engine to normal operating tempera-
ture.
Stop the engine and remove the spark plug (page
3-6).
Install a compression gauge.
Shift the transmission in neutral and open the
choke lever (OFF).
Open the throttle all the way and crank the engine
with the kicksterter until the gauge reading stops
rising.
COMPRESSION PRESSURE:
981 - 1,177 kPe (10.0 - 12.0 kgf/cm2 , 142 - 171
psi) at
1,000
rpm
Low compression can be caused by:
- Blown cylinder head gasket
-Improper valve adjustment
-Valve leakage
-Worn piston ring or cylinder
High compression can be caused by:
- Carbon deposits in combustion chamber or on
piston head
CAMSHAFT REMOVAL
Drain the engine oil (page 3-9),
Remove the following:
-valv8 adjuster hole cap (page 3-7)
- left crankcase cover (page 10-2)
- sealing bolt, tensioner spring and tensioner push
rod to loosen the cam chain tensioner (page 10-4)
Disconnect the spark plug cap.
loosen the cylinder head side cover 6 mm bolt.
Tap the head of the 6 mm bolt and release the
cylinder head left side cover from the cylinder head.
Remove the 6 mm bolt, seating washer and cylin-
der head left side cover.
Turn the crankshaft counterclockwise, and align the
"0"
mark on the cam sprocket with the index
notch on the cylinder head.
Secure the cam
Remove the bolts, cam sprocket and dowel pin.
chaIn with a piece
of w/re to pravent
It from faffing into
the cylinder.
CYLINDER HEAD/VALVES
COMPRESSION
7-3