Downunder is quite right about using an all castor based fuel. Do not let any experts tell you differently. I have several 50 year old Enya 29/35's and they are all running quite well.
One of the problems with the Enya was they were made out of some of the hardest material ever used in a piston and liner and really do take almost forever to break in the motor. Follow all the break in info that you have been given and take your time with it.
Incidentally these are old style baffled piston designs, as such they are not high revvers. They hit their best power at about 11k. best prop is a 10/6 use a HOT plug