Bajaj Discover 100M, Service Station Manual

Page: 109 / 319

CARBURETTOR CIRCUITS
Discover 100 M
Service Station Manual
78
Dealer Development Center
Akurdi Pune
PILOT SYSTEM - Slow Speed System
•
•
•
The pilot system provides the air fuel fixture at idling and at small throttle opening when the main system is not in
operation.
Fuel from the bowl is metered by the pilot jet and mixed with the air proportionately controlled by the air screw. The
atomized fuel reaches the venturi through the pilot outlet and mixes with the air flowing through venturi. The pilot
outlet is located on the manifold side of the carburettor and is just covered by the throttle valve wall. Since the
throttle valve is almost closed at idling speed, the pilot outlet is only partially exposed to the manifold vacuum.
Hence it gives minimum fuel just to run the engine. When the throttle valve is raised opening throttle, pilot outlet is
fully exposed to the manifold vacuum and supplies fuel to its full extent which is sufficient to meet the engine
requirement at slow speed.
Air-fuel mixture becomes lean when Air Screw (AS) is loosened (AS turned anticlockwise) and rich when it is
tightened (AS turned clockwise).
Air
Filter
Side
Engine
Side
Main Jet
Pilot Jet
Float
Idling
Adjusting
Screw
Delivery
Of Air - Fuel
Mixture
Air Screw
Cap Throttle
Magnet (TPS)
Fuel Inlet
Venturi
Air Inlet
Float Pin
Petrol
Float
Chamber
(Bowl)
TPS
(Hall Sensor)
Air
(For Pilot Jet)
Side View
pieli[T s)ATm {Ali[ Ap)D s)ATm}
TPS
hi[l s[ºTr
a[r Ak|&
a[r fy&al
m)xrn) D)l)vr)
a[eDl)>g a[DjAT)>g Ak|&
fli[T
pieli[T j[T
m[en j[T
Y\i[Tl k[p
m[gn[T { }
TPS
fy&al enl[T
v[ºc&r)
sieDni[ d[Kiv
a[r enl[T
fli[T p)n
hvi {pieli[T j[T miT[}
p[T^i[l
fli[T c[Àbr {biul}
pieli[T j[T s)ATm, aieD)l)>g an[ ai[Ci K&l[li Y\i[Tlmi> jyir[ m&²y s)ATm cil& n hi[y Ryir[ hvi fy&aln&>
m)xr p&r& piD[ C[.
hvi fy&al n&> m)~N jyir[ a[r Ak|& { } Q)li[ Yiy Ryir[ l)n {ai[C&>}hi[y an[ TieT hi[y Ryir[ r)c {vFir[}hi[y C[.
AS