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You probably just need a new Shear Pin. This is just a small steel pin like a nail that goes through the gear and the drive shaft. If the strain on the final drive exceeds specs, the pin shears through and thereby saves damage to the gears and motor.
You can get the appropriate pins in the prop not kits sold by minn Kota or thru major retailers. Trolling Motor Replacement Props Minn Kota Motors
You will find prop nut kits here just follow the link.
Is there a hole thru the shaft of your replacement shear pin ?
If so the curved wire is a retention clip. Pull the clip out of the pin. insert into the proper location. The straight part goes thru the hole and the curved part automatically clips over the shaft to hold the shear pin in place.
YOU NEED TO REMOVE FLYWHEEL REMOVE OIL PAN. REMOVE REAR OIL SEAL HOUSING BOLTS. USING THE PRY POINT LOCATED AT THE EDGE OF THE CRANKSHAFT REAR MAIN SEAL HOUSING SHEAR THE RTV SEALANT. REMOVE THE REAR MAIN OIL SEAL. INSTALL GUIDE PINS INTO THE TWO CRANK SHAFT REAR OIL SEAL HOUSING CORNER BOLT HOLES OF THE ENGINE BLOCK.INSTALL THE CRANKSHAFT REAR SEAL INSTALLING TOOL ONTO THE REAR OF THE CRANKSHAFT FLANGE. APPLY A 0.2 INCH 3MM BEAD OF SILICONE SEALANT TO THE REAR OIL SEAL HOUSING . INSTALL THE REAR HOUSING TO THE ENGINE BLOCK.REMOVE THE GUIDE PINS AND INSTALL THE HOUSING BOLTS TIGHTEN THE BOLTS TO 89 INCH LBS. REMOVE THE REAR SEAL INSTALLATION TOOL FROM THE CRANKSHAFT FLANGE.THEN INSTALL OIL PAN AND FLYWHEEL.
You most likely sheared off the shear pin that keeps the driveshaft and the blade in right timing with the motor and piston. What happens then is the exhaust valves are not open at the time the piston should be in it's correct position where the cylinder pressure and gases can be exhausted at the right time. Also if it did manage to run it would run very roughly. The shear pin is designed to break or "shear" off when a hard object is struck so that you do not ruin your engines drive shaft that attaches to the blade. So what happens is that the shaft turns out of sync with the timing of the engine and putting it simply, the intake and exhaust stages are all messed up and that makes for an engine that is hard to pull over or if it does and it starts, it runs very badly. Spark plugs firing at the wrong times versus the valves and piston positions. Fortunately it is rather easy to replace a sheared off pin yourself. Once you get the new pin, there are a number of YouTube videos that will show you how to replace a sheared pin. Just type in "replacing a Shear pin in a lawnmower engine. It helps to put the brand of the motor of your lawnmower in the search as well. It is actually quite easy for a semi handy man. Hope that helps. I suspect all the other answers so far pertaining to pull/rip cords are incorrect but that is my opinion only.
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