The trick to priming an OI pump without the old starter wheels is to let the bike run at idle (oil inj cover off) and pull the oil injection cable only wfo. The pump sounds like it's working but a little premix wouldn't hurt until you sort the pump. Generally they are bulletproof.
If it was smoking and didn't seize while running you might be ok. The old Enduro's were tuned pretty rich from the factory and a lot of them load up the bottom end.