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 to_T 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.