Originally Posted by AdventureDave
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.
thats the one i mean, and not needing a fuel pump is the added advantage, less to go wrong, didn't realize the 640A had a pump i thought they came in later
definitely no oil in frame but i am going to look at a 640A for oil routing this week to determine a reservoir location but if you have photos of your version that would be a great help as its a direct model for model comparison, put them up on here if you have them