your fault will probably be one of these 3 in this order, 1 not enough battery voltage to the starter motor so try charging your battery or replace it, 2 starter motor is LAZY and therefoe cannot spin the bendix gear in the transmission cover quick enough for it to turn the crank, or you actuall starter bendix is very lazy, i have changed shed loads of these, the spring starts to weaken
m, November 2010