26946 Suzuki RM250’
FUEL SYSTEM 9-5
Jet Needle
Needle Clip Position
The jet needle is linked to the throttle valve by means of the needle clip. Its lower part is tapered and it has tive grooves cut in the upper part where the needle clip fits.
To adjust the air/fuel mixture with the jet needle, change position of the needle clip which is set in the 3rd groove. The lower groove the clip is moved toT the higher the jet needle rises and the larger the clearance with the needle jet becomes, resulting in <; a richer air/fuel mixture ratio. \ t \ \
|
Air/fuel mixture |
Needle type and clip ppsitłob |
|
Lean T Rich |
NE.CH 1$t \ \\ V' |
|
>N E D^-/l s| H\^ ' | |
|
: C................ '' | |
|
v—NE,OH-2nd | |
|
v.;..-NECH-3rd | |
|
NEDH-3rd | |
|
NECH-4th | |
|
NEDH-4th | |
|
NECH-5th | |
|
NEDH-5th |
Needle number
NEDH
T
O.D.
Changing the .needle itself Controls air/fuel mixture
ratio partioulÄ…ry on, lower mid-throttle opening. The
smÄ…l.ler the, O.D.; the richer the air/fuel mixture
becomes. \ Vâ– ">*'
\ \ \
|
Air/fuel, mixture y* |
Needle Number |
O.D. |
|
Lean i Rich |
NECL/NEDL |
2.765 mm |
|
NECK/NEDK |
2.755 mm | |
|
NECJ/NEDJ |
2.745 mm | |
|
NECW/NEDW |
2.735 mm | |
|
NECH |
2.725 mm | |
|
NEDH |
2.725 mm | |
|
NECG/NEDG |
2.715 mm | |
|
NECF/NEDF |
2.705 mm |
Main Jet
The main jet, like the slow jet, meters fuel flow. Each jet size is indicated by a number. Larger number means a larger borÄ™ diameter and fitting a larger numberd main jet enriches the air/fuel mix-ture.
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