Sunl 110 will not crank and no spark PLEASE HELP?

I have a sunl 110 i bought. the Wheeler needed bushings and a battery. Before i bought it the people push started it and popped it in gear and it ran. So i bought the swing arm bushings and replace them and then i bought a battery. I put the battery on and i pulled the brake lever and turned the key on and it wouldn't crank. So then i ran a screw driver across the solenoid and it cranked over but it has absoluely no spark. I played with it for a while and unpluged the brake safety switch thinking that it was acting up and it still has nothing. Finally i remembered the fuse and checked it and the fuse was bad. So i have to get a fuse tomorrow but i tempoarily slid open the plastic pieces and connection the two br ends for the fuse to see if the fuse was the problem and it still didn't crank unless i ran a screwdriver across the solenoid and i still have no spark. I dont think my solenoid is bad i think that maybe i have a broken wire or a safety switch like the brake is bad or also maybe the cdi is bad. I was wondering if anyone could help and if you knew what tests i can run to find out what is wrong. My dad is good with electricity and he has the voltmeter and everything but he doesnt know what to test or any steps in order to single it down to whats wrong. does anyone know what to do? thanks