Without spending some dosh fella, I cant see how you would loose substantial weight off it at present...
Places I would look at though are :
Seatpost
Seat
Stem
Bars...
Grips... Ritchey WCS Foam grips... cheap to replace and weight nowt
Inner tubes... continental supersonics weigh less than 100g each.. £ 10.00per tube, but cheap gram lost per £..
These are where you could loose a lot of weight depending on how much you spent..
Places I would look at though are :
Seatpost
Seat
Stem
Bars...
Grips... Ritchey WCS Foam grips... cheap to replace and weight nowt
Inner tubes... continental supersonics weigh less than 100g each.. £ 10.00per tube, but cheap gram lost per £..
These are where you could loose a lot of weight depending on how much you spent..