With stock gearing 80-82 mph
KTM recommends Motorex Top Speed 4T 15W5 (0.7L)
I am assuming you mean gear oil, KTM recommends .7L of Motorex Top Speed 4T 15W50.
90mph
110mph
The Top Speed Is Around 80 mph
60 mph
About 70mph
90mph
KTM recommends Motorex Top Speed 4T 15W50
With stock gearing top speed would be 50-52 mph.
The top speed of a 2009 KTM 150 XC is approximately 65-70 mph, depending on factors such as rider weight, terrain, and maintenance.
The speed of a "300 cc" motor depends on how much weigh the engine is pushing. Generally, the 300 cc motors on power scooters can go anywhere from 35-50 MPH. On a small car, about 35 MPH... though if you loaded the engine on a bare-bones go cart, you could get it to go up to 50 MPH or so....