drama.drummer

I recently purchased a 1974 yamaha tx500 and am having trouble starting it. It was sitting for a while in the previous owners garage ... when i went to purchase it it fired up on the 2nd try a-okay... but i seem to be having problems with it now, 2 days later. I am just curious what it could be. The electric start seems to be working, however its not turning over, and firing up the engine. Any words of advice? thanx.