You're going to want a 40:1 ratio. Also, with the 787cc motor, it has a rotary valve that is going to need lubrication that will not be covered by the block off. Loop the RV lines with oil in them and you'll be ok.
hi guys.im new to all this,but wanting some help to convert my ski to pre-mix.if someone could give me a step to step guide on doing this i would be very grateful.thanxs