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Stock NSR250 jet settings.

MC16:

Venturi Diameter	28mm
Carburettor Type	TA10A
Float Height	13mm
Main Jet	#110
Slow Jet	#38
Needle	No.1 2QY	No.2 2QZ
Idle Speed	1,200 100rpm
Throttle Cable Free Play	2 - 6mm
Air Screw Position	1½ Turns out from fully closed

MC18 (R2J/R4J):

Venturi Diameter	32mm
Carburettor Type	TA20A
Main Jet	No.1 #130	No.2 #132
Needle	No.1 BPD	No.2 BPE
Power Jet	No.1 #75	No.2 #70
Air Screw Position	2 Turns out from fully closed

MC18R / MC18R SP (R5K/R6K):

Carburettor Type	TA21A
Main Jet	#128
Needle	No.1 BPG	No.2 BPH
Power Jet	#75
Air Screw Position	2 Turns out from fully closed

MC21R / *MC21R SE/SP (L,*N):

Carburettor Type	TA22 \| *TA22B
Main Jet	#128
Needle	No.1 J81E \| *J3LB	No.2 J81E \| *J3LC
Power Jet	No.1 #72	No.2 #75
Slow Jet	*#38
Air Screw Position	1 \| *1½
Idle Speed	1,250 100rpm

MC28R / *MC28R SE/SP(R,*S/T):

Carburettor Type	TB10A \| *TB10B
Main Jet	#140
Needle	16135-KV3-950	16131-KV3-950
Power Jet	No.1 #75	No.2 #80
Slow Jet	#38
Air Screw Position	13.7mm
Idle Speed	1,250 100rpm

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