Thanks for the reply, with fuel cap off it still does it, fuel pump is strong, I at a loss. 

Hi everyone I am new on the forum and have an issue with my 2016 400, unit starts fine, fires up straight away but it dies after 5 seconds, if i push the throttle it dies, sometimes it will run through the dead moment and keep running but coughs and splutters and will back fire, could it be a crank position sensor? or skipped a tooth on the cam? TIA