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The 450 SX is a single cylinder 4 stroke, so no you do not mix gas.
it was a 4 stroke
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
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
ktm 450sxf
yes sir it is
using to much oil in the gas
KTM!!!
KTM
85
no only a ktm 50 engine will work good for a 3 stroke 380