I run Klotz R50 with 93oct (40:1) and it runs awesome....I recommend that you always run 93 if I was you.
Klotz R50 Racing TechniPlate(Reference #KL-105)
100% synthetic lubricant developed exclusively for use in Hi-RPM 2-stroke racing engines. TechniPlate R racing lubricity system protects engines from extreme heat and virtually eliminates engine wear. R50 film strength is comparable to castor oil with the benefits of Clean Burn technology.
Klotz recommendation: ATV: Water cooled mix at 40:1, Air cooled engines mix at 32:1
And it smells awesome....