Just as an update for any who may be reading this post later on in time ,, I contacted Morris Mini Motors in England, they are some Saito radial experts and asked them this question. The answer I received was yes it is fine, he stated if it was easy for him to get thats all they would use. So,, I will be running 100LL as that's what I run in all my 2 strokes and it performs flawlessly.