Honda C65 - Choke (Starting System); Adjusting the Fuel Level; Fuel Level Gauge Diagram

46
Q) Throttle valve
@ Needle
I
@ Spring
3. ENGINE
@ Choke valve
@ Relief valve
1. CHOKE (STAR T! G SYSTEM)
Since it is necessa ry to prov ide a rich mixture for
a short period dur ing co ld we ather star ting , choke @
is incorporated. By ra isi g the choke lever to the
full close position , the choke v alve @ can be com-
pletely closed . A r elie f va lv e @ is installed on the
c:;hoke valve and kept in the clo s ed position by the
spring
@. When the kick pedal is kicked with the
throttle valve @ opened app rox im ate ly U: , the suction
pressure causes the fuel to be di
sc harged from the
pilot outlet ® and the nee dl e jet @, and at the
same
time, the suction pressure ca us es the relief valve
to open a proper amount, per mi tting the air to enter
and produces a fuel mixture which is idea l for starting.
@ Relief valve
After the engine starts, the suctio n pressure in-
cr eases, opening the relief valve wider and furnishes
the
co ld engine with the proper starting fuel mi x ture .
In this wa y, the opening of the throttle valve causes
a
co rresponding opening of the relief val ve and
permits the worming up of the engine without manip-
ulating t he choke lever. When the engine has warmed
up, merely pos it io n the choke val ve to the fully open
pos it ion . (Fig. 3- 11 0)
Figure 3- 110. Choke
@ F
loa t arm pin
Fig11re 3- 111. Fuel level adjustment
Figure 3- 112.
Fu el level gauge
5. ADJUSTING THE FUEL LEVEL
It is difficult to directly measure the fuel level,
h ere fore, the fuel is de termined by measuring the
height (H ) of the flo at. (Fig. 3-111, 3- 112)
(1) P osition the carbu r etor as sho wn in fig . 3. 111 '
w it h the float arm pin @ to ward the top and
the float @ at the bo tt o m and t ilt the c arburetor
to the p oin t whe re the flo at arm @ is about to
b reak co ntact with the flo at v al ve base. This
s hould · oc c ur wh en the c arbure t or is tilt ed ap-
pro ximately 70 ° o r at an y po int be twe en 50 ° to
70°. That is, the flo at arm should be at a po ini
where the ba se of the valv e is no t compresse d.
121 In this position , the float bo ttom @ is meas ur ed
fr om the carburet o r bod y @ with the ga uge ®
to determine the he igh t (H I. Th e to le ra nce of
the float pos iti o n is 1 mm 10.040 in) both wa ys.
In o ther w or ds, the gauge should no t pre ss the
float m ore than 1 mm , nor sh o uld the re be cle ar -
ance grea t er than 1 mm betw een the gauge and
the flo at . Cor e s hould be exc er si ze d in ma king
the measurement sin ce the bose o f the valv e is
s
pring loaded an d can be co mpre sse d int o the
valv e in wh ic h case, the tru e closing po int of the
valve cannot be determined.