Honda NSA700A DN-1 2009, Service Manual

Page: 238 / 654

CYLINDER HEAD/VALVE
CYLINDER COMPRESSION
To measure the
cylinder
compression o f
each cylinder,
remove only one
plug at a time.
To avoid discharging
the battery, do not
operate the starter
m otor for more
than seven
seconds.
W arm up the engine to norm al operating tem pera­
ture.
Stop the engine, disconnect the spark plug caps and
rem ove one spark plug at a tim e.
Install a com pression gauge into the spark plug
hole.
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
seconds.
Com pression pressure:
1,569 ± 98 kPa (16.0 ± 1.0 k g f/c m 2, 227.6 ± 14 psi) at
400 m in '1 (rpm)
Low com pression can be caused by:
- Blow n cylin d e r head gasket
- Im p ro p e r 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, w ashers and
rubber seals.
Be careful n ot to
Remove the cylinder head cover and gasket.
damage the wire
harness and mating
surfaces when
removing the
cylinder head cover.
CYLINDER HEAD COVER
GASKET
9-6
a