I am currenly in the youth catergory of racing which means i need a 52 chainring and 16 up cassette, as my maximum gear ratio. At the moment i'm using a miche 16-26 cassete which weighs 450g. this is wat to heavy does anyone have any lighter suggestions? maybe doing some custom cassettes or combining cassettes?
i run campag 10 speed

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yes, but how much does it weigh?

You can use a smaller chainring and smaller sprockets, can't you?

I would recommend going the smaller chainring route. That's what I did in my junior racing days, and it really simplifies everything. Calculate your gear inches and have a shop order you an appropriate ring setup.

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This board and the world in general would be a much nicer place if everyone could just take themselves a little less seriously.

if i remember correctly i used a 40 ring with a straight through 12-21 cassette as a youth
52x16 is the same as 39x12 so the 40 will give you a slightly larger gear too

From memory, my son ran a 53x14 using attack/force which was bang on the restriction.
edit: Just re-read the op, my apologies this was as a junior.

thanks guys,
but i forgot to add that i have already used the small chainring system. i need the large cassette because the spare wheels in a race are all 16 up

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yes, but how much does it weigh?