Topic: Motors

[1976Thunder]

I would like to know what if any motors would fit in a cb550k Frame.

[dustyc]

500, 550, 650.

Edited to add:  That was just faster than writing "Search the forum", but that's the best place to start when you have a question. 

[1976Thunder]

Thank you do I have to change anything. Like the motor mounts or anything? I would love to fit a 750.

[dustyc]

From what I've read, they're a direct swap.  You might have to do some creative thinking when it comes to the airbox or carbs with the 650.  It's pretty tight in that space.

[dustyc]

750 won't go without serious modification.  Might as well get a 750.

[1976Thunder]

I just will keep wishing for a 750 for now. Its a good bike that needs some love and I found some motors around town this opens alot of options for me now. Thank you.

[mkramer1121]

650 in a light framer like the 550 is balls out.  Look up paulages thread about his current build.  A 650 engine overbored to 718cc in a 550 frame.

[1976Thunder]

Man that guy has taken it to a whole new level.