This kit includes all necessary parts to make your own
D725 (https://www.ebay.com/itm/296257010125) or
D825 (https://www.ebay.com/itm/295543021346) or
TILT525 (https://www.ebay.com/itm/296209019228) or
FLEXI125 (https://www.ebay.com/itm/296468179837)
To complete the kit you need:
1 - One the following bikes: Dahon Vybe D7 / Dahon Qix D8 / Btwin Tilt 500 / Carraro Flexi 121
2 - HONDA GX25 Engine
3 - Schwalbe Kojak 20x1.35 tyre ( for D725, D825 and Tilt 525) or Panaracer Minits 20x1.25 tyre (for FLEXI 125)
4- U-brake caliper
All relevant videos are available at DR1L channel