Honda CRF450R 2012 Service Manual

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CYLINDER COMPRESSION TEST
To avoid disclla rging
the ba rr ery. do not
opera te t he starter
motor for mor e
than 7 seconds.
Warm up the engine.
Stop the engine and remove the spark plug (page 4-
12).
Connect a compression gauge.
Open the th r ottle fully.
Crank the engine wit h the electric starter or
kickstarter until the gauge needle stops moving.
The maximum read in g is usually reached within 4-7
seconds when using electric starte r.
COMPRESSION: 402 kPa (4.1 kg /c m 2, 58 psi)
at 360 rpm
low compression ca n be caused by:
- Imprope r valve adjustment
- Valve leakage
- Blown cylinder head gasket
Worn piston ring or cyl inde r
- Faulty
decompressor system
High comp ression can be cau se d by :
-
Carbon deposits in combustion chamber or on
pisto n head
- Faulty
decomp ressor system
CYLINDER HEAD COVER REMOVAL
Remove the fuel tank (page 3- 8) .
Disconnect
the spark plug cap and crankcase
breath
er hose.
Remove
the bolts, cylinde r head cover and packing.
CYLINDER HEADIVALVES
COMPRESSION GAUGE
9-7

Honda CRF450R 2012 Specifications

General

Brand	Honda
Model	CRF450R 2012
Category	Motorcycle
Language	English