Honda CRF50F 2004-2015 Service Manual page 82

CYLINDER HEADIVALVES
CYLINDER COMPRESSION
Warm up the engine to normal operating tempera-
ture.
Stop the engine and remove the spark plug (page 3-
81.
Install a compression gauge.
Shift the transmission in neutral and open the choke
lever.
Open the throttle all the way and crank the engine
with the kickstarter untit the gauge reading stops
rising.
COMPRESSION PRESSURE:
981 - 1. 177 kPa (10.0 - 12.0 kgf/ cm
2
,
142 - 171 psi)
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 3-11)
Remove the following:
- Valve adjuster hole caps (page 3-9)
- left crankcase cover (page 10-4)
Sealing bolt, tensioner spring and tensioner
push rod to loosen the cam chain tensioner
(page 10-6)
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 cylin-
der head left side cover from the cylinder head.
Remove the
6
mm bolt, sealing washer and cylinder
head left side cover.
Turn the crankshaft counterclockwise, and align the
. o ·
mark on the cam sprocket with the index notch
on the cylinder head.
Secure the cam
Remove the bolts, cam sprocket and dowel pin.
c/lam wah a plfJCe
of
WIre to prevent It
from falling Into
the
"""' ' ' ' ' '
7-6
DOWEL PIN