On my chart it recommends a 110 mainjet, screw half a turn out from seat, and needle clip position moved one spot. Anyone have any experience with a 250 at 6000 feet?? Anyone with a better setup?? How about clutch changes, they don't recommend any until 6000 to 9000 feet? thanks

 

If you're just going up to 6000 ' & you'll only be there for a short while I don't think you have to rejet. You'll lose some horsepower but it should run fine. If you're not going to be in water , you could always take the breather cover off .