need help with ignition wiring

[lyerkey]

can someone smarter than me please help! I recently purchased a 2002 GZ250 as a first streetbike for my son. We bought it very reasonably because it was a recovered stolen bike. the seat, headlight, ignition switch, turn signals had been taken. I have a whole garage of old junk (mostly early 70's honda twins, suzuki dr370, gn400's) and felt it would be simple to retrofit alot of parts that i have to make it complete. However, I cannot get it to fire. I read on a thread from Bad Bob about the floating ground on the trigger. Is there any way around a factory switch to make this fire? I read the ground wire (blk/wht) has 96 ohms impedance, so i went to radio shack and bought a 100 ohm resistor and ran the ground though it, but when i put power to the orng/ylw hot wire i still had no spark. i really don't want to put a fortune in this by buying one factory component after another to get it to fire. also, does anyone know if the old gn250 engine was identical? could i take the igntion system off of one of those, or does it still have the same type of set up. any help appreciated, thanks, Loren