HUSQVARNA motorcycles starter jet Mikuni TMX 125-300 ’17-’21

HUSQVARNA motorcycles starter jet Mikuni TMX 125-300 ’17-’21

The HUSQVARNA motorcycles starter jet Mikuni TMX 125-300 ’17-’21 is an OEM idling jet for Mikuni TMX carburetors used on Husqvarna and KTM 125–300 cc two-stroke models from 2017 onward. It controls the low-speed circuit for stable idle and clean off-idle response on engines equipped with this carburetor.

Technical specifications

• OEM part number: 55431007475
• Jet type: Idling / pilot jet for low-speed carburetor circuit
• Calibration size: 47.5 (marked as „IDLING JET 47.5”)
• Carburetor compatibility: Mikuni TMX two-stroke applications (Husqvarna/KTM 125–300 cc 2017–2019)
• Diagram reference: Position 21 in Husqvarna TE 300 2017 carburetor parts diagram
• Part origin: Genuine Husqvarna/KTM OEM carburetor jet

Fitment

• Husqvarna: TC 125 (2017–2022), TC 250 (2017–2022), TE 250 2017, TE 300 2017, TX 125 (2017–2019), TX 300 2019
• KTM: 125 SX (2017–2022), 125 XC-W (2017–2018), 150 SX (2017–2022), 250 EXC 2017, 250 EXC SIX DAYS 2017, 300 EXC 2017, 300 EXC SIX DAYS 2017

Use and replacement context

This idling jet is used when restoring correct low-speed fueling on Mikuni TMX-equipped Husqvarna and KTM two-strokes, especially after contamination, wear, or incorrect jet changes. It is commonly replaced together with other carburetor jets and cleaning or overhaul work to return the carburetor to stock specification.

Installation notes

The jet installs as a direct replacement in the Mikuni TMX carburetor at the specified position; use the correct screwdriver, tighten to manufacturer torque guidance, and verify carburetor jetting and idle settings after installation.