The magnetic coil on a Tecumseh engine interacts directly with the engine's flywheel in order to provide for proper motor operation. The distance between the two parts is known as the air gap. An improperly spaced air gap can result in engine failure. You can adjust the Tecumseh engine's coil in relation to the flywheel and correct air gap problems without any professional assistance.
Ensure the Tecumseh engine is not running.
Find the spark plug at the top of the engine. It is partially inserted into the spark plug hole and is connected to the motor through a single, black ignition wire. Pull the ignition wire out of the back of the plug before proceeding. Set the spark plug aside.
Find the Tecumseh's flywheel at the back of the top of the engine assembly. The flywheel can be quickly identified thanks to its circular shape and iron cover. Directly in front of the flywheel is the engine's magnetic coil. This coil nearly touches the flywheel.
Measure the gap between the magnetic coil and the flywheel using a caliper. Again, this is the air gap and it is crucial to engine operation. Ensure the air gap is between 0.010 and 0.015 of inch in width. You will need to adjust the coil in relation to the flywheel if the gap is less than 0.010 inch in width or more than 0.015 inch in width.
Use a socket wrench to remove the bolts holding the magnetic coil in place on the engine block if the air gap is too large or small. Slightly adjust the coil by moving it incrementally closer or farther away from the flywheel, depending upon what your air gap measurement was. Use your caliper to again measure the gap to ensure it falls within the 0.010 to 0.015 inch range.
Reinsert the magnetic coil's bolts with your socket wrench.
Slide the ignition wire back into the rear of the Tecumseh's spark plug.