I'm sure the different tube, shoulder harness, and starter must all add up to make that weight difference, but no one thing seems all that much heavier than what is on the X models. I really don't know where the weight is all at, but you can feel the difference between the X and the C trying them on back to back and wearing them around for a few minutes. I have to agree with TT ( I know! We've agreed twice in one day and even the same thread gasp

) the 600's are all you need in the summer months if you have one, but last summer I ran my 800 all summer and this year I am back on the 802 for the summer. Spread the work load around and make them last longer sorta thing.