The 450 SX is a single cylinder 4 stroke, so no you do not mix gas.
gas oil ratio for 1994 ktm 50 junior
Supreme (or the highest grade) gas and (automotive) synthetic 5w 30 oil if you can't get to a bike shop. It's best to use ktm oil though. And if you're referring to two stroke oil, you can use basically any two stroke oil concentrate but again is best to use ktm oil
Yes, a 2009 KTM 400 xcw uses 97 Octane or higher.
50/1
40:1
The only two I know is KTM (Austria), and Gas-Gas (Spain).
the ratio is 50:1 on my ktm 125sx, for every gallon of gas you have, you need to use 2.56 oz of oil. i use Amsoil, its expensive, but its the best synthetic two stroke racing oil there is. the gas should be light pink if you mixed it correctly. hope this helps
40:1
Premium unleaded. It says this on the gas tank cap.
Paraffin oil is a gas at 450 oC.
under the gas tank