Dave,I have great difficulty in reading and understanding your post.
Perhaps you should have someone proof read it and coach you in the use of spelling, capitalisation, punctuation and the use of paragraphs.
Oils do evaporate in the combustion chamber due to the high temperatures there. They also combust there - liquid fuel does not combust until it becomes a vapour.
You appear to be basing your premise, that biodiesel is good for your 2 stroke engine, because you have used it for a couple of hours.
Please come back and post your results, when you have used it for several hundred hours of hard work using biodiesel as the only lubricant in the petrol. I doubt that you will get 100 hours.
I will then be happy to discuss the results you have obtained.
Biodiesel is NOT a suitable substitute for 2 stroke oil.