Thanks for the replies. The todotrial site is excellant, even though i can't read a word of Spanish, a great help. Thanks Tim. 
I went to the wobblies trial at Nash Mills last week and joined the club the same day. Just waiting for my riding gear to arrive and i will be out practicing. 
This might seem a obvious question, but i am not used to 2 stroke mixing.  A 50 to 1 mix, how much would that be in cc/fl oz to the gallon? 
Thanks  
Jim