Now that is a good question!
I would try a 40:1, I use the Poulan 2-stroke oil (available at any hardware or lawn & garden center) it's great for Weed-eaters, and any other 2-stroke that uses 40:1. Toss the 3.2 oz into 1 gallon of regular.
I've been using this in the DiBlasi R7E engines (their M1) without a problem.
I must admit I have let the project fall by the wayside- but I'm resuming work on it and the Di Blasi R7Es we use for ScooterGuy here in St. Louis.
My problem with the Kamasura frame is, well, when I'd get cranking to where the engine starts to sputter- the chain comes off the rear hub- and I have to stop...reseat the chain...and it's frustrated me. Thus the engine transplant on a much cooler bike.
I will be posting more shortly!