Oil pump for me too, my H2 oil pump is still going, all I did was clean it, replace the seals, clean the oil lines, get the spring and ball kit from Tom(link in kawi3cyl post) clean the check valves and now it's all good.
I also ran the oil pump in my H1 500 race bike, for 5 faultless years, so for me, it's the oil pump all the way like everyone above
