FALSE !!!
Ive owned over 20 KTMs and they are as simple on maintenance as any on/off road bike. The only interval that is more frequent is oil changes, only due to a smaller oil capacity. I personally change my oil every 10hrs, because I ride off road and ride them in elements far greater than average street use, but thats just me. There are threads on ADV forums where people are taking KTM 500s around the world without issue, and doing oil changes at 3-4K miles. I check my valves on my 4 strokes once a year, and have yet to move enough where I needed to adjust them. My 02 KTM 520 EXC had over 20K miles, valves never moved. I raced that bike in hare scrambles and dual sported it off road in between, even rode it to races and back home. My 2 strokes are even less maintenance, I dont even have to mix gas for them any more. The biggest expense for my riding is replacing tires, those I seem to wear the shit out of because of where and how I ride.
Add gas, clean the air filter when needed, ride, rinse, repeat
BTW, my 2018 500 is pushing 70hp, has close to 10K miles, and only had oil changes and air filter cleanings, oh and I put a chain and wheel bearings on it recently (several sets of tires) it sees just as much road as it does dirt, because I ride it to dirt, aint no trailer queen. It would have more miles if I didnt have several bikes to choose from. Shit, my 21 300 XCW has 3K miles, only sees dirt, and I bought that this Feb, gets fresh oil every 10hrs (takes 10 min) Add in that I moved across country since I bought it too
My Ducati is my maintenance whore, had to adjust the valves twice on it now, and it gets as many oil changes as my dirt bikes. Less tires thou