2007 YAMAHA WR 450F fuel

7 - 4
TUNSETTING
Main jet adjustment
The richness of the air-fuel mixture at full throt-
tle can be set by changing the main jet 1.
If the air-fuel mixture is too rich or too lean, the
engine power will drop, resulting in poor accel-
eration.
Effects of changing the main jet (reference)
ÈIdle
ÉFully open
Standard main jet #162
1/4 1/2 3/4
+10%
#162
–10%
#172
#152
ÈÉ
Pilot jet adjustment
The richness of the air-fuel mixture with the
throttle open 1/4 or less can be set by adjust-
ing the pilot jet 1.
Standard pilot jet #45
Effects of adjusting the pilot jet (reference)
ÈIdle
ÉFully open
1/4 1/2 3/4
+5%
–5%
#48
#42#45
È
É

7 - 6
TUN
Effects of changing the jet needle (refer-
ence)
(Diameter of the straight portion)
Changing the diameter of the straight portion
adjusts the air-fuel mixture when the throttle is
1/8 to 1/4 open.
ÈIdle
ÉFully open
1/4 1/2 3/4
+10%
Q
–10%
P
R
ÈÉ
Leak jet adjustment (accelerator pump
adjustment)
The leak jet 1 is a setting part that adjusts the
flow of fuel discharged by the accelerator
pump. Since the accelerator pump operates
only when throttle is open, the leak jet is used
to adjust a fuel mixture ratio for quick throttle
opening and is therefore different from other
setting parts that adjust a fuel mixture for each
throttle opening (each engine speed).
1. The engine breathes hard in quick throttle
opening.
Select a leak jet having lower calibrating
No. than standard to enrich the mixture.
#60 → #55
2. Rough engine operation is felt in quick
throttle opening.
Select a leak jet having higher calibrating
No. than standard to lean out the mixture.
#60 → #65
Standard leak jet #601
SETTING

7 - 7
TUNSETTING
Relationship with throttle opening
The flow of the fuel through the carburetor
main system is controlled by the main jet and
then, it is further regulated by the area
between the main nozzle and the jet needle.
The fuel flow relates to the diameter of the
straight portion of the jet needle with the throt-
tle 1/8 to 1/4 open and relates to the clip posi-
tion with the throttle 1/8 to 3/4 open.
Therefore, the fuel flow is balanced at each
stage of throttle opening by the combination of
the jet needle straight portion diameter, and
clip position.
Carburetor setting parts
Part name Size Part number
Main jet Rich
(STD) Lean#185
#182
#180
#178
#175
#172
#170
#168
#165
#1624MX-14943-44
4MX-14943-94
4MX-14943-43
4MX-14943-93
4MX-14943-42
4MX-14943-92
4MX-14943-41
4MX-14943-91
4MX-14943-40
4MX-14943-90
Pilot jet Rich
(STD) Lean#55
#52
#50
#48
#454MX-14948-09
4MX-14948-08
4MX-14948-07
4MX-14948-06
4MX-14948-05
Jet needle Rich
Lean
GDDUM
GDDUN
GDDUP
GDDUQ
GDDUR
GDDUS
GDDUT5TJ-14916-9M
5TJ-14916-9N
5TJ-14916-9P
5TJ-14916-91
5TJ-14916-9R
5TJ-14916-9S
5TJ-14916-9T
Rich
Lean
GDDSM
GDDSN
GDDSP
GDDSQ
GDDSR
GDDSS
GDDST5TJ-14916-AM
5TJ-14916-AN
5TJ-14916-AP
5TJ-14916-A1
5TJ-14916-AR
5TJ-14916-AS
5TJ-14916-AT
Leak jet Rich
(STD)
Lean#35
#40
#45
#50
#55
#60
#654JT-1494F-01
4JT-1494F-03
4JT-1494F-05
4JT-1494F-07
4JT-1494F-09
4JT-1494F-11
4JT-1494F-13

7 - 8
TUN
Examples of carburetor setting depending on symptom
This should be taken simply for an example. It is necessary to set the carburetor while checking
the operating conditions of the engine.
Symptom Setting Checking
At full throttle
Hard breathing
Shearing noise
Whitish spark plug
Lean mixtureIncrease main jet calibration no.
(Gradually)Discoloration of spark plug
→
If tan color, it is in good condition.
If cannot be corrected:
Clogged float valve seat
Clogged fuel hose
Clogged fuel cock
Check that the accelerator pump oper-
ates smoothly.
At full throttle
Speed pick-up stops
Slow speed pick-up
Slow response
Sooty spark plug
Rich mixtureDecrease main jet calibration no.
(Gradually)Discoloration of spark plug
→
If tan color, it is in good condition.
If cannot be corrected:
Clogged air cleaner
Fuel overflow from carburetor
Lean mixture Lower jet needle clip position.
(1 groove down)
The clip position is the jet needle
groove on which the clip is installed.
The positions are numbered from the
top.
Check that the accelerator pump oper-
ates smoothly (except for rich mixture
symptom). Rich mixture Raise jet needle clip position.
(1 groove up)
1/4 ~ 3/4 throttle
Hard breathing
Lack of speedLower jet needle clip position.
(1 groove down)
1/4 ~ 1/2 throttle
Slow speed pick-up
Poor accelerationRaise jet needle clip position.
(1 groove up)
Closed to 1/4 throttle
Hard breathing
Speed downUse jet needle with a smaller diame-
ter.Slow-speed-circuit passage
Clogged
→ Clean.
Overflow from carburetor
Closed to 1/4 throttle
Poor accelerationUse jet needle with a larger diameter.
Raise jet needle clip position.
(1 groove up)
Poor response in the low to
intermediate speedsRaise jet needle clip position.
If this has no effect, lower the jet nee-
dle clip position.
Poor response when throttle
is opened quicklyCheck overall settings.
Use main jet with a lower calibration
no.
Raise jet needle clip position.
(1 groove up)
If these have no effect, use a main jet
with a higher calibration no. and lower
the jet needle clip position.Check air cleaner for fouling.
Check that the accelerator pump oper-
ates smoothly.
Jet needleClip
Groove 7 Groove 6
Groove 5
Groove 4
Groove 3
Groove 2
Groove 1
Leaner
↑
(Standard)
↓
Richer
*
SETTING