7 - 10
T U N
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 mixture
Increase 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 mixture
Decrease main jet calibration no.
(Gradually)
Discoloration of spark plug
→
If tan color, it is in good condition.
If cannot be corrected:
Clogged air filter
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 speed
Lower jet needle clip position.
(1 groove down)
1/4 ~ 1/2 throttle
Slow speed pick-up
Poor acceleration
Raise jet needle clip position.
(1 groove up)
Closed to 1/4 throttle
Hard breathing
Speed down
Use jet needle with a smaller diameter.
Slow-speed-circuit passage
Clogged
→
Clean.
Overflow from carburetor
Closed to 1/4 throttle
Poor acceleration
Use jet needle with a larger diameter.
Raise jet needle clip position. (1 groove
up)
Poor response in the low to
intermediate speeds
Raise jet needle clip position.
If this has no effect, lower the jet needle
clip position.
Poor response when throttle
is opened quickly
Check 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 filter for fouling.
Check that the accelerator pump oper-
ates smoothly.
Jet needle
Clip
Groobe 7
Groobe 6
Groobe 5
Groobe 4
Groobe 3
Groobe 2
Groobe 1
Leaner
↑
(Standard)
↓
Richer
*
SETTING
www.PlanDeGraissage.org
Содержание WR250FR 2002
Страница 1: ...LIT 11626 16 48 WR250FR 5UM 28199 10 OWNER S SERVICE MANUAL www PlanDeGraissage org...
Страница 2: ...www PlanDeGraissage org...
Страница 5: ...www PlanDeGraissage org...
Страница 12: ...MEMO www PlanDeGraissage org...
Страница 118: ...3 53 INSP ADJ BATTERY INSPECTION AND CHARGING Charging method using a variable voltage charger www PlanDeGraissage org...
Страница 119: ...3 54 INSP ADJ BATTERY INSPECTION AND CHARGING Charging method using a constant voltage charger www PlanDeGraissage org...
Страница 143: ...4 21 ENG 9 Install Clamp 1 Refer to CABLE ROUTING DIAGRAM section in the CHAPTER 2 1 CARBURETOR www PlanDeGraissage org...