Dear Mr. Know-It-All,

My 2023 KTM 300XC-W has about 120 hours on it and has been flawless … until yesterday. The bike was running as if it was fouling a plug. It would not clean out, like a bad case of laryngitis. I changed the plug, put fresh fuel in it and made sure my filter was spotless, and still no changes. What could be the culprit?

Alex B

via [email protected]

Alex, it’s a new-world order with these fuel-injected machines. The TPI KTMs have numerous sensors, and one of these is most likely your machine’s infection. I believe it’s the crankcase pressure sensor (has a black tube leading to the back of your cylinder), and over time the tube accumulates debris and carbon from within the cylinder. Once clogged, it provides a false reading to the machine’s brain, the ECU. I would remove this tube and the sensor itself, and clean it with a contact cleaner and compressed air. Once scoured, your machine should run crisp and clean. This process should be a periodic form of maintenance on the TPI machines.

Dear Mr. Know-It-All,

I’m a Beta 500 dualsport rider and have trouble getting forward in the turns. I’m pretty flexible, but it feels like the bars are in my stomach, and my rear end is hanging off the rear fender. I’m 6-foot-4, 205 pounds in full dress.

Thanks for the feedback (if you actually answer this!)

Drew L.


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Dirt Bike P.O. Box 957

Valencia, CA 91380-9057

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