The Myth of the IMS / ZipTy tank. I'm wanting to get a IMS tank to suit a WR250F 2004. After searching the forums there seems to be a lot of different opinions on them. It seems from the search that people with WR450F 2005 models have had the most problems of fuel lines being to close to the header and the tank rubbing on the engine. There are a lot of different treads about these tanks but no real answer. The 2005 models are meant to of been lowered slightly. I heard that the frame was lowered at the headstock. Could this be causing the problem cause the frame is more compact or did they reduce the ground clearance as well? I know that IMS makes the ZipTy tanks but are they the same apart from the having the option of a right side petcock? Also is the tank for the WRF and YZF the same with just a moveable front mounting lug for the different seats. When you look at the picture's on the IMS website the tank for the WRF has a lot more clearance above the header than the YZF. Also the kickstart fits better into the tank on the WRF. I think the the photo of the WRF is a 250 and the YZF is a 450 and that makes the difference. Sorry about all the questions but im looking to buy 3 tanks to import to Australia so I just want to know if there is really only 1 model of IMS tank or more.