Originally Posted by rtwpaul
this is the tank, the 27/28 liter
the Safari tank works with the original seat and doesnt need a fuel pump, so is a good option. The KTM Adventure tank needs a fuel pump, but the Genuine KTM 18 lt tank needs the 'comfort' seat (std adventure seat) and mine holds 20.5 litres. I dont think they are available new anymore, but you can still buy the Safari tanks.
as mentioned the Australian 625's came with the oil in the frame holding 1.9 lt total. the 2007 model came std with cush drive rear hub.