Yes they are oil injection. A lot of people convert to pre-mix, but so far I haven't had any problems. On the first tank you can always pre-mix a few gallons, plus the oil injection. Yes it will smoke more but at least you will know you are getting oil.
I have used Partshark in the past. I think I can post this, since it doesn't compete with PP
1996 Yamaha WAVE BLASTER II (WB760U) Repair Kit 2 | Part Shark