hi connrdt175,
i have an rd350lc , i disconected my perfectly good working oil pump as soon as i got the bike in favour of pre-mixing.
i don't trust oil pumps, as when they fail ,the first you know about it ,is when the engine siezes and your flying through the air at high speed (not good).
if you put the oil into the petrol/gas, you know it's in there.
yours will differ from mine ,but i put 350ml (a small pop bottle) too 10 ltr of fuel..
also use semi synthetic two stroke oil ,the best you can afford, i use silkolyn t2 comp for off road use , nothing else will do,not for me anyway.