Hey everyone new to this site and the bike scene. Picked up my first bike a 77 CB550 k. The previous owner stretched, chopped and made the bike rigid, Ill go more into that in a build thread. My question is, I just picked up a CB450 as a parts bike for some small odds and ends and it has a 6 spd trans. I'm wondering if this trans is compatible or adaptable to my 550. I know they are different style engines, 2 cyl to a 4 cyl and I've tried searching around on the net but cant find any info which leads me to believe the swap cant be done. A trans swap wasn't the intention when purchasing the bike but a 6 spd sure would be a nice upgrade. Any help and or info would be great, so far this site has helped me out with a few bugs I had to work out, so much info and so many build threats its easy to get lost for hours and not even know it.