Last weekend at the REM races, N2-Dirt’s Brian Bolding found five KTM 350SXF’s with loose crank nuts on the clutch side. This nut cannot fall off the end of the crank, but it can spin against the case, wear enough aluminum away to clog the oil lines and even allows the snap ring and crank seal to walk out. We recommend that you check the nut on the end of the your KTM 250 or 350 crank — it does require draining the water and removing the impeller to get to. The first signs are some strange engine noises, followed by the cam chain tensioner’s hydraulic lines getting clogged and eventually a ton of aluminum in your oil filter (you may have to cut the oil filter open to see it). We talked to KTM and expect a KTM dealer bulletin to be sent out. This only affects KTM 250SXF and 350SXF engines and not the 450SXF.