spluttering and refusing to start.?

[ashyt73]

Alright guys, been having a few problems with the beast.
broken down a couple times and found the cause to be a lack of fuel. i then found the fuel pump to be siezed so i sorted it.
now i have the same symtoms again, spluttering/lack of power and now refuses to start at all.. iv checked the fuel pump and it seems to be in working order.
any suggestions to what might be the cause?

cheers

[jack sharpezxr 400 L]

hav u ever changed the fuel filter

[lewisdale]

clean the carbs?

[diesel]

whip the tank off. drain the carbs via the small screw at the bottom and see ( and taste ) what comes out. sounds like fecked carbs due to water in the bowls but the colour and taste of the fuel coming out should help.