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It sounds enough like a fuel pump & system issue that that's the first place I would start. The tank has to come off to get to the fuel pump. See the link below for Husaberg 70° manuals. There is a 2009 450/570 repair manual in the folder but that shouldn't be an issue for the info you're after.https://drive.google.com/drive/folders/0B_X2MDkeGC0hRW1aYm9qX0o4MWM
It sounds enough like a fuel pump & system issue that that's the first place I would start. The tank has to come off to get to the fuel pump. See the link below for Husaberg 70° manuals. There is a 2009 450/570 repair manual in the folder but that shouldn't be an issue for the info you're after.
https://drive.google.com/drive/folders/0B_X2MDkeGC0hRW1aYm9qX0o4MWM