with ignition on, warning light on , you will have slightly less than battery voltage at lead which is usually present after w/light has gone out for a few seconds when voltage returns to zero.is engine turning over fast enough, is correct battery fitted,[the higher cca spec the better], is engine oil correct grade and not too thick,check engine earth connections are good and clean,make sure that fuel supply pipe isnt chaffed and drawing air,check hand primer also for drawing air,when was fuel filter last changed?
k
February 2012