04 pro xr 800 swap to a 600 ves

You'll need an airbox, the correct pipe and y-pipe (can too, unless you want something aftermarket), engine mounting straps, carb boots. If you're still looking, I have some loose parts in my shop for this swap. Feel free to PM me.

You will need all of the electronics from the 600 chassis, wiring, CDI, oil pump. You can go to any polaris parts page and compare numbers and you will see that the 600 and 800 have very few common parts. Furthermore, the O4 probably has reverse and the 02 does not. OR you might experiment using the 800 stator, the 800 secondary clutch, the 800 CDI, the 800 electrical wiring to the left handlebar controls, just to see if you can get the 06 running and have a reverse on it. The 800 oil pump probably puts out oil faster than the 600 oil pump, but the 800 oil pump works in reverse, which is not a big deal if it doesn't because reverse is used only for brief moments. You will use the 600 carb boots and the 600 reeds. The 600 engine mounts are different than the 800. Look the parts numbers up at dealers websites.