Cylinder Compression; Cylinder Head Cover Removal - Honda NSA700A DN-1 2009 Service Manual

CYLINDER HEAD/VALVE

CYLINDER COMPRESSION

W arm up the engine to norm al operating tem pera­
To measure the
ture.
cylinder
Stop the engine, disconnect the spark plug caps and
compression o f
rem ove one spark plug at a time.
each cylinder,
Install a com pression gauge into the spark plug
remove only one
hole.
plug at a time.
Operate the N/D clutch to the neutral.
Open the th ro ttle all the way and crank the engine
w ith the starter m o to r until the gauge reading stop
rising.
The m axim um reading is usually reached w ith in 4-7
To avoid discharging
seconds.
the battery, do not
operate the starter
Com pression pressure:
m otor for more
1,569 ± 98 kPa (16.0 ± 1.0 k g f/c m 2, 227.6 ± 14 psi) at
than seven
400 m in '1 (rpm)
seconds.
Low com pression can be caused by:
- Blown cylinder head gasket
- Im proper valve adjustm ent
- Valve leakage
- W orn piston ring o r cylinder
High com pression can be caused by:
- Carbon deposits in com bustion cham ber or on
piston head

CYLINDER HEAD COVER REMOVAL

FRONT
Remove the PAIR system Ipage 6-72).
Remove the cylinder head cover bolts, washers and
rubber seals.
Remove the cylinder head cover and gasket.
Be careful not to
damage the wire
harness and mating
surfaces when
removing the
cylinder head cover.
9-6
CYLINDER HEAD COVER
GASKET