Bike is 98 R1100RT. 33K miles. I replaced a good original hall sensor with a new hall sensor. Bike was running fine with the old one. Started bike after installing new one and bike is only running on left cylinder. Removed pulley and rechecked timing by setting engine at top dead center and listening for fuel pump to switch on, it does. Checked to make sure of proper placement of pulley tab, it is correct.
Put everything back together and still only running on one cylinder. Changed sparkplug, made no difference.
Guess I fixed it till I broke it.
What could it be?