i run MC-1 high performance with premium gas in my 06 yz 125. if i dont use premium i go through 2 er 3 spark plugs a day so be sure and use premium
go to a motorcycle store and ask what kind for your bike, give them size year and if its a two or four stroke, and if its a two tell them if its for the engine of gas mix
Best to use two stroke oil. Mix it with the petrol, (I guess you know this)
4 stroke oil
I have a 1998 CR250 and i mix it 32:1
Your bike is a 2 stroke. since you are mixing gas and oil together oil naturally blows out your tail pipe. if this is happening, then there is nothing wrong with your bike, unless it is 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
Two stroke Oil. Penzoil makes a good one
There is no difference in 4 stroke and 2 stroke oil, except that 2 stroke uses non-detergent oil. 2 stroke oil is actually 30 weight non-detergent (30wt ND) oil. Oil with detergents will leave deposits in 2 stroke cylinders, and is not recommended.
If your 2 stroke dirt bike starts to smoke really bad that means you have to much oil in the fuel or the wrong kind of oil. Or the pistons, oil rings or cylinders are badly worn.