1983 omc model ss181, boat 18' starcraft 120 horse power 2.5 four cylinder, when i try to put it in gear with the throttle handle it won't go foward to put it in foward or it won't go back to put it in reverse, when i pull the little red button on the shifter handle to put it in gear, help please, thanks<br /><br />how do i adjust shifter cable