KTM 250 SX 2019 User Manual

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TECHNICAL DATA 21

139

21.3.6 300 XC US

Carburetor type MIKUNI TMX 38

Carburetor identification number TMX 38 80

Needle position 2nd position from top

Jet needle 6BFY43-75 (6BFY42-75)

Main jet 450 (430, 440, 460)

Idling jet 25 (22.5/27.5)

Starting jet 80

Needle jet S‑4

Idle air adjusting screw

Open 1.5 turns

21.3.7 Carburetor tuning (300 XC US)

402896-01

M/FT ASL Sea level

TEMP Temperature

ASO Idle air adjusting screw open

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General

Displacement	249 cc
Bore x Stroke	66.4 mm x 72 mm
Starter	Kickstarter
Transmission	5-speed
Ignition	Kokusan
Ground Clearance	375 mm
Seat Height	950 mm
Engine Type	2-stroke
Clutch	Wet, multi-disc clutch
Frame Type	Central double-cradle type 25CrMo4 steel
Front Suspension	WP XACT 48 mm fork
Rear Suspension	WP XACT shock absorber with linkage
Front Brake	Disc brake, 260 mm
Rear Brake	Disc brake, 220 mm
Fuel Tank Capacity	7.5 liters