Yamaha SRX440 1980 Service Manual page 39

CAUTION: - - - - - - - - - - ,
Never attempt to disassemble the fol-
lowing parts.
1) Throttle valve
2) Throttle shaft
Reason:
1) The threaded portion of the screw is
clinched after the throttle valve is in-
stalled to the throttle shaft so that
the screw will not come loose.
2) The bypass hole is precrsron-
machined so that the correct dist-
ance can be maintained from the
end of the throttle valve. Therefore,
if the throttle valve is once disas-
sembled, it is difficult to reproduce
the original dimensions, and thus
engine performance will be ad-
verselyaffected.
1980 SRX440
2. Inspection
-CAUTION: - - - - - - - - - - ,
1) Before checking, thoroughly clean
all parts in gasoline, and blow the
jets, float chamber and fuel pas-
sages in the carburetor body with
compressed air so the dust and dirt
can be removed.
2) When washing the carburetor body
and float chamber, be sure to use a
soft brush.
3) When decarbonizing the throttle
valve and its adjacent area, take
special care not to scratch the throt-
tle valve and throttle bore.
4) Never use a hard wire or the like
when cleaning jets. It could scratch
or deformed jet holes, thus adversely
affecting fuel consumption.
5) Use care so that all parts are not de-
formed.
4-7
'l . Power jet
2. Starter circuit
3. Main air jet
4. Slow air jet
5. Main jet
6. Jet nozzle
7. Slow jet nozzle
8. Pjlot jet
9. Starter jet (Body jet)
®