SHD you need to reread the posts by opjose very carefully. It is becoming obvious that the GMS is your first ABC or ABN engine. All modern ABC/ABN engines are hard to turn over by hand in some cases just about impossible. You cannot expect your engine to turn over like you Super Tiger a ringed engine these are untappered and are operated differently.
'
Stop turning your engine over dry and by hand. Put it in an airplane or 'good' test stand and start it with a starter and most vital of all get someone knowledgeable to walk you through good operating methods and tunning steps. You are going to experiance further major frustration if you don.t get some help.

John