Inspection And Adjustment; Maintenance; Engine Tune-Up; Measuring Compression - Honda CB450 1968 Service Manual

6. INSPECTION AND ADJUSTMENT
6 . I
Main te nance
Preventive maintenance is per iod ical maintenance
combining checking, repairing, and adiusting various
part s and systems for the veh icle, and sometimes
the ter m "p reventi ve mainte nance" is also used
for maintenance of vehicle components to maintain
efficien cy .
A. Engine Tune-up
En gine tune-up is a method to recover the normal
engine condition. This is correc tive action and
differen t from inspec tion. The engine condition is
decided by the fo llowi ng, and by checking and
taking necessary acti on. the recove ry can be ac-
comp lished.
Compression System
Ignition System
Power System
Fuel System
As long as these four major systems are satis-
factor y , the engine is in go od cond itio n. In the
fo llowing, measurements and corrective . action to
be taken are explained by the individual iten,.
l . Mea suring Compression
If the comp ression is insufficient , the engine
loses power .
1f
there is w eak compression.engine
rot ation decreases and engine may stall at· low
speeds.
a. Remove the spark plug.
b. Inserting compression gauge head into the
plug ope ning, holding it firmly so that compres-
sion is not lost.
(Fis. 6. l )
c. Fully openin g the throt t le gri p and choke,
kicking repeatedly, quickly and power fully.
NOTE :
( 11 Remember to open the throt tle gr ip and
choke f ully otherwise , the value on the co m-
pression gauge
wi(I
be small.
(2) The compression gauge value wil l rise gradu-
all y with each kick ; conti nue kicking until the
gauge pointer reaches maximum.
Fig. 6, 1 Compression measureme nt