1200 For 865 Engine Swap?

You will need to change all manner of items and it will be expensive and time consuming, firstly you will need to modify the engine mounting points, and line up for the correct chain run, wiring loom, ECU, and fit all the required ancillaries such as the air box, sensors, etc etc, personally I would keep the bobber and modify it to what you want, unless it is a complete write off and designated not to be put back on the road (Cat B), although you can use all the parts, a Cat B should never be offered for sale as a complete machine. The bobber is a fantastic base machine for customising when using an insurance write off, it does not take much for assessors to write of a machine these days as new OEM parts are that expensive.

 

While it's true that throwing enough time and money at something can make it possible, I agree with Iceman.
Not sure about the 865 but the 1200 twin is bigger in every dimension than the 900 cc unit so will it even fit in the frame? If it does then new mounts should be relatively simple to fabricate but that's the easy bit. Long gone are the days of relatively simple engines with carbs and basic ignition. Modern engines with all the associated wiring, electronics, sensors, ECU's etc offer much more potential for problems and can quickly turn such projects into money pits.

 

Thanks for sharing these insights mate as I found it very much useful and informative.