Hell, I run 2 stroke oil with every fill up in all my old bikes. 100:1 ratio, mixed in a 5 gal can with marine stabil. Keeps tanks from rusting, keeps petcocks working smoothly, carbs as well, keeps top ends lubed. And the new 2 stroke oils don't smoke or stink, you can't tell at that ratio. plus...what oil does pass through the engine to the exhaust, coats the pipes and will help keep them from rusting (have you ever seen a 2 stroke with pipes rusted from the inside out?).
Just my .02. from 10 years experience doing this.