I'm not planning to do this straight away, but I'm looking through options to decide which way I will go. A lot of you will say it's not worth the money for this bike I'm sure, but I want my first bike to be my project bike - my '89 GS500e. I am not that interested in keeping it with original specs and will be swapping out parts as I go, as I see fit. One thing I would like to upgrade is the motor, either seeing what I can do to bore this one out a bit, or hopefully, swapping in a different one. From what I understand, this motor is 497cc (or there-abouts) and was adapted from the earlier 450cc model. I'm thinking all they did was bore it out to the 497. Can anyone confirm this? What is the go with bolting in a different motor? How interchangable are they, and any ideas what is my options for compatible ones? Thanks for any help.