hi have an an aprilia rally 50 on an 02 plate. and every so often after running it wen i come to start it a couple hour later it just floods. i remove my spark plug and it is covered in petrol and fouled. but eventually after nearly breaking my foot from kicking it up it starts but is very smokey? any ideas why? cheers btw it took me half an hour to start it the other day cos of this problem