What jetting for a ktm 250 xcf at altitude?

When jetting a KTM 250 XCF at altitude, it's important to consider that the thinner air will require a leaner fuel mixture. Typically, you might need to decrease the main jet size by 1 to 3 sizes, depending on the elevation and specific conditions. Additionally, adjusting the needle position and pilot jet may also be necessary to optimize performance. It’s advisable to conduct plug reads and test rides to fine-tune the settings for optimal performance.