I guess It might help a little to know what kind of plane it is and what knid of motor it has and if any mods have been made.
One thing I can say with complete confidence is.... if it is a trainer is should not have to be rebuilt in order to train a youngster to fly it!!!!!!
lharvey: Maybe you should seek out a local club to help you so the helper could see what you actually need help with.

Miloh.