gotta buy them gears

http://www.ebay.co.uk/sch/i.html?_nkw=7+SPEED+SCREW+ON+FREEWHEEL&_sacat=0&_sop=15&_odkw=sprocket&_osacat=0&_trksid=p3286.c0.m270.l1313

http://www.ebay.co.uk/itm/7-SPEED-THREADED-SCREW-FREEWHEEL-14-24-MTB-TOURING-HYBRID-RETRO-NEW-UNUSED-/230739334715?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item35b922d63b

http://www.ebay.co.uk/itm/SRAM-7-Speed-Cassette-Sprocket-/270911428284?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3f139456bc

http://www.ebay.co.uk/itm/SHIMANO-TOURNEY-7-SPEED-SCREW-FREEWHEEL-14-28-TEETH-/330640527810?_trksid=p4340.m1374&_trkparms=algo%3DPI.WATCH%26its%3DC%252BS%26itu%3DUCC%26otn%3D5%26ps%3D63%26clkid%3D6230616642458012815



single sprockets:

http://www.ebay.co.uk/itm/honda-c90-sprocket-/260948960552?pt=UK_Motorcycle_Parts&hash=item3cc1c52528

http://www.ebay.co.uk/itm/kawasaki-z1000-front-sprocket-14-teeth-/250989104073?pt=UK_Motorcycle_Parts&hash=item3a701dcbc9

http://www.ebay.co.uk/itm/GO-KART-SPROKET-/140695238558?pt=UK_Cars_Parts_Vehicles_Other_Vehicle_Parts_Accessories_ET&hash=item20c216f79e

http://www.ebay.co.uk/itm/95-KAWASAKI-ZZR-400-REAR-SPROKET-AND-CARRIER-/220896298699?pt=UK_Motorcycle_Parts&hash=item336e7206cb

http://www.bicyclewarehouse.com/product/wald-chrome-steel-sprocket-13406.htm

set of sprockets:
http://www.ebay.co.uk/itm/GO-KART-84-86-87-90-91-92-TOOTH-REAR-SPROCKETS-ROTAX-USED-JOB-LOT-/270904606581?pt=UK_Cars_Parts_Vehicles_Other_Vehicle_Parts_Accessories_ET&hash=item3f132c3f75