MM, I’m using Amsoil Interceptor 2 stroke oil. Like any other engine oil, everyone has their favourites and this was recommended to me. Bought a lifetime supply, but in retrospect would have preferred something that had colour. This oil is a natural light amber colour.That RD350 I had back in the 70’s used to absolutely fog the neighborhood with blue smoke when I rode it. What kind of injector oil are you buying, I’ve been out of the two stroke game for a long time, I was thinking there are some brands / types of injector oil that don’t smoke as much?
On a somewhat related note, I remember this old fishing boat my dad used to have with an old Evinrude outboard , an early design it ran a very rich 12 -1 oil mix and it just about smoked you out of the boat! Years later his new Mercury outboard was running a 50-1 ratio and it was nearly as clean as a four stroke.
What I’m wondering is if maybe early two stroke motorcycles didn’t run a super rich oil mix, and smoking is unavoidable.
re: outboard motors, my little 6 hp Yamaha fishing boat motor ran 100:1 (premixed) on synthetic Yamalube. Virtually smoke free although you may see a small puff on start up. When I was a kid we had a 5.5hp Evinrude that ran 16:1. Back then we didn’t have 2 stroke oil. We just used straight SAE 30 engine oil!