Ive been using 25:1 W/Amsoil Sabre PRO - Smokeless for 2 years in both my models with no problems. Its says 100:1 but don't go there. Stay with somewhere between 25:1-32:1. I have not noticed an increase in performance when leaning the oil and some say the more oil the more the engine seals so stay rich your motor will love you for it. http://www.amsoil.com/products/twocycle/2cycle_chart.aspx
Any of the following will work great.
And most of the cycle shops,lawn equipment,and home and garden places carry those and alot more its very important to pick a good quailty oil not just anything off the shelf.
Some manufactures even make there own oils and alot of people will swear by them.Just make sure whatever you buy it has the capability of handling 18000rpm and still provide good lubrication.I would recommend something synthetic and go with a well known brand.I use Bel-Ray and have been for years over 18 now and its never let me down.