DOS SIX Roller Variator for Derbi 505 Case iron bore with a

Case iron bore with a 2-ring piston should offer a long and reliable life

Custom machined Morini head by Moped Factory

It still has a ton of charm and with some love could be a really nice bike and practical daily rider

Pair with a radiator for better performance

If you have the reed cases

DOS SIX Roller Variator for Derbi 505 Case iron bore with aNew DOS SIX Roller variator for Derbi mopeds! This is designed to fit your Flatreed, Piston Port, or Pyramid Reed engine. Simple bolt on upgrade for any setup. Will work great for mild stock setups all the way up to the hottest blasters built. 6 roller design allows multiple tuning options over a 3 roller setup. You will likely have side cover issues with Piston Port or Pyramid Reed engines. These fit nicely under Flat Reed engine covers though.