Fill the water bath canner with water and bring to a boil while preparing the pears.
Wash all of the jars, lids, and bands in hot soapy water.
Cut the pears in half, remove the skins, and scoop out the seeds and cores. While preparing the pears, soak the cut pears in a bowl of cold water with a splash of lemon juice (1 tbsp) to prevent browning.
In a 6 quart stock pot, bring the water, sugar, and cinnamon to a simmer, stirring often.
In batches, simmer the prepared pears for 5 minutes.
Using a slotted spoon, remove one half pear at a time and stuff into the jars. Each pint jar will hold 6 halves. Add 1 tsp of lemon juice to each jar.
Using the food funnel, fill each jar with the simple syrup, leaving 1/2 inch head space.
Remove any trapped air from the jars with the bubble popper and adjust liquid if needed.
Wipe the rims of the jars with a clean, damp paper towel.
Place the lids on the jars and tighten the bands finger tip tight.
Using the jar lifter, carefully lower the jars into the boiling water bath.
Cover and process in the boiling water for 20 minutes. (sea level processing time, adjust for altitude if needed)
Remove the jars from the water bath with the jar lifter and place on a towel lined cutting board to cool. Allow to rest for 12 hours before labeling, dating, and storing. If any jars do not seal, refrigerate and use first.