Depends on how much money you want to spend.
1) New rear wheel (less spokes, lighter/thinner rim, etc)
2) New lighter rear tire (most tire mfg publish weight)
3) Thinner (and thus lighter ) rear tire tube
4) Remove pegs (or lighter pegs, drill holes into pegs?)
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get a new stump seatpost (stolen thermalite is what i got. PC pedals(once again Stolen Thermalite) new Wheels, cromoly stem idk what brands no gyro if u have one, hollow chromoly axles. check dans comp, PC pivotal seat (oddessy is what i got), Cromoly cranks, and 2 pc bars (if u have 4peice ones