6. INSPECTION AND ADJUSTMENT
6. I Main tenance
Preventive maintenance is periodical maintenance
combining checking, repairing, and adiusting various
parts and systems for the vehicle, and sometimes
the term "p reventi ve maintenance" is also used
for maintenance of vehicle components to maintain
efficien cy .
A. Engine Tune-up
Engine tune-up is a method to recover the normal
engine condition. This is correc tive action and
differen t from inspection. The engine condition is
decided by the fo llowi ng, and by checking and
taking necessary acti on. the recovery can be ac-
complished.
Compression System
Ignition System
Power System
Fuel System
As long as these four major systems are satis-
factor y, the engine is in good condition. In the
fo llowing, measurements and corrective . action to
be taken are explained by the individual
iten,.
l . Mea suring Compression
If the compression is insufficient, the engine
loses power .
1f there is w eak compression.engine
rotation 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 opening the throt tle grip and choke,
kicking repeatedly, quickly and power fully.
NOTE :
( 11 Remember to open the throttle grip and
choke fully otherwise , the value on the co m-
pression gauge
wi(I be small.
(2) The compression gauge value wil l rise gradu-
ally with each kick ; conti nue kicking until the
gauge pointer reaches maximum.
Fig. 6, 1 Compression measurement
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