Hi, I just found this formum. I bought this motorized bike with no book so I am somewhat ignorant of what I really have but it is great fun. I need to buy a Z8CLD spark pluig and can not find it. Also this year the bike starts but has no power when going uphill it stalls. I live in upstate NY and lots of hills and too old to pedal uphill. Looking forward to this site! Hons