Two Smokers are a thing, I don't much like them but have had a few and they were pretty good .
My favorite was a 1968 (?) Suzuki X6 Hustler, 250CC twin with 6 speed tranny, boy howdy did that thing fly, even two up and I'm not small neither was my psycho-b*tch girlfriend and it tore up the Sta. Monica Mountains .
I also had a 1967 Yamaha LY2-C, 100CC electric start single, a sturdy little bike that my buddy had in high school, he wasn't able to break it no matter how hard he tried, he ran it on DRAIN OIL and still it soldiered on .
Decades later I stumbled across one at the original El Camino Moto Swap Meet, it had a simple electrical problem so the shop sold it to me for $150 (TIP : don't take your grocery money to the swap meet !) , I fixed the electrical problem and rode it hard until a leaky crank seal caused it to hole a piston .
I used fully synthetic two stroke oil so it didn't smoke but it sure was noisy ! .
In 1973 or so I had a Bridgestone 100 single, this model had a chrome lined cylinder, it was O.K., rotary shift that nearly but my dumb @$$ over the handlebars a couple times, after a few weeks I traded it for a Honda CT90, *much* slower but able to be ridden flat out as long as you wanted, just like every other old Honda Moto .
I think I rode a Kawasaki triple a few times, way too much m\bike for my limited riding skills ! .