Running without oil injection just premixed gas.

[Sean1965]

So I got my bike running, but the oil injection does not work. I have been running it with 20:1 gas/oil mixture. Am I doing harm to the bike? Or can I keep running it with pre-mixed gas?

[subrew]

You'll be fine running premix.  One thing to remember, is that at high rpm, when you lift, you're not bringing in oil/gas (as much as with the throttle open.)  I tend to not do a lot of high rpm engine braking, and if i run down long hills, I'll pull the clutch in so the engine speed drops.

Plenty of two-strokes didn't have oil injection.