Now I know everyone else is going big these days but Id like to hear what eric or some of you other mechanics think of deboreing my engine on my 01 cr 250. When I have the cash I would like to get a extra cylinder and have it setup as a 200 or 220 or whatever is reasonable, obviously a piston to fit it and carb mods. What are the disadvantages to doing this, I should be able to swap jugs back and forth as I wish right? Im looking for a cylinder setup that will mimick a kdx220 after its been ported for woods racing. I know this sounds dumb but its something ive been thinking about doing for along time. I would like to start the season with a less powerful engine and then swap back to the original bore. Besides the smaller sleeve and porting what else has to be done for the engine to perform correctly with the smaller bore? jetting? Thanks