Keihin Idle Jet 42 for KTM 85/125/250/300 SX EXC 1994-2026 - 54531607042

This genuine Keihin Idle Jet 42 is an essential OEM component designed for precise fuel delivery at low engine speeds. It regulates the air-fuel mixture during idling and initial throttle opening to ensure smooth engine performance and reliable starting.

Compatible with an extensive range of models, including the KTM 85 SX, 125 SX/EXC, 150 SX/XC, 200 EXC/XC-W, 250 SX/EXC/XC, and 300 EXC/XC/XC-W from 1994 to 2026. It also fits Husqvarna TC 85, TC 125, TE 125/250/300, and GasGas MC 85 models. Additionally, it is used in larger displacement machines like the KTM 450 and 530 EXC/SX-F series, Freeride 250 R, and various Rally Factory Replica models.

Manufactured to exact Keihin specifications, this brass jet provides consistent flow rates and high resistance to fuel additives. Replacing a clogged or worn idle jet is critical for resolving erratic idling, stalling, or hesitation issues during low-end acceleration.

Installation requires access to the carburetor float bowl. We recommend checking your service manual for the correct jetting specifications based on your altitude and temperature to achieve optimal engine tuning.

Check compatibility list below to see if this part fits your motorcycle model.