Recently I bought a 1980 KZ 1000 that had been setting for 12 years. The throttle and choke were stuck and the inner gas tank had a little rust. other than that the bike appears to be all original and in premium shape. The bike fires up and runs, but only on 1 cylinder. Any Ideas? could it be points and condesers? I also just replace both coils because they had heat stress cracks. Any ideas would be much appreciated!