Stupid Question

What if any (aside from the engine and exhaust) are the differences between the kz440 and the kz550? I found a 550 inline 4 thats seen better days, but the engine is mint, and my engine is not all that great...

so is it possible to swap my 440 twin and put in the 550 with little to no modification? for the sake of keeping things simple lets say they are both chain driven.

It will be a WHOLE lot of work.
The handling will probably be dangerous.

i guess that settles it, id rather tear down and rebuild the engine i have than to spend countless hours creating a death machine.

next question... how do the after market pipes sound on the twin?