what to use for a premix 657x ?

[shakedown]

I just bought a 95 speedster (657x times 2) that has the oil blockoffs installed, I still have the oil (XP-S 2 Stroke Synthetic) going to the crankcase via the oil resivor, What I need to know is (1)whats the best ratio to use, 40:1 or 50:1 ?
(2) what can I use for a premix? thats going to be wallet friendly and take care of the engine at the same time?

 

[kustomkarl]

Keeping the oil lines to the engine cases for the rotary valve shaft is necessary. The proper mix is a 40:1 mix. Keep the synthetic oil for the premix. The worst thing that will happen is it will foul spark plugs as the oil injector used a variable rate of injection with injector pump, it won't be able to do now, and it will be using more oil.

Karl