Sorry for not mentioning the size of it (thunder tiger pro 91) i looked in the manual and it is supposed to have a shim in the top and gasket in the rear seal as well both are missing they are sold as one part PN0194 gasket set ,local hobby garage also said to use coke can as well but for one i dont have a circle cutter and i dont know what part of the head it goes yet. will go see the bloke i buy my parts from tommorow he is a jack of all trades.
thanks for all your advise will let you know once i get a gasket of soughts in there.
The motor goes in my pheonix extra 300 its a 46 size plane and was ok with the motor running bad but cant wait till its tweaked.