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you could try a higher cranking battery but cost alot it could be your starter is dragging to might need new starter to you would have measure the voltage at the starter if its a old lawnmower my geuss would be starter espessally if yove have to hook a car battery to it
Try turning your engine by hand counter clockwise to see if it isn't under cylinder pressure..if it turns try to start...if still nothing and your battery is good you most likely have a bad solenoid..it connects the power from the battery to the starter..follow your heavy wire usually red from the positive side of your battery and from the starter..you will find it at their ends connected to two large post..it has small wires attached...that is the solenoid.. a quick way to see if it is bad is to put the switch on the run position then take a screw driver and cross it on both post,, making a direct connection bypassing the coil,,,It should crank and start your engine..if it does you need a new coil...easy job depending where yours is located..normally just below the ignition switch..under the hood or dash board..good luck..
Is the noise you hear actually the solenoid popping or the starter gear jumping into the flywheel?? You say it finally starts so I am guessing the starter is engaging and actually bumping the flywheel a little. If that is the case it is probably a dragging starter or weak battery. First thing is to be sure the battery is fully charged then see if it will turn over easily. If not you may have a started problem.
From your description it seems that the starter is not engaging to turn over the engine. First ensure all the connections of the thicker cables to the battery, starter and tractor frame are clean and tight. If starter motor is turning but still not engaging it will mean that the pinion on the starter motor is binding on the shaft. You can buy a new starter pinion gear from your local B & S agent.
To replace pinion, remove starter motor from engine, remove old pinion and put on new one and reattach starter to engine. If fuel & spark are right you should be up amd running.
Only if you tried drag racing the car - not that you'd win with a Taurus. Dragging as you describe is usually caused by a defective battery or starter, but you've replace those. I'd now look at the condition of the primary wiring (thick red wires) from the battery to the starter and the starter relay. Also check the ground connections to the block and the chassis (thick black wires). Corroded connections can drop a lot of voltage at high current. Take'em apart, clean and polish them, squirt some wd40 (prevents corrosion) on them and put them back together. Hope this helps, if not, then maybe someone else on Fixya can help.