Eight Four Suited vs King Jack Offsuit

At the flop:
Winning 26.92% of the time
Tied 0% of the time
Losing 73.08% of the time

At the Turn:
Winning 32.47% of the time
Tied 0% of the time
Losing 67.53% of the time

At the River:
Winning 37.56% of the time(16.36% with trips or better)
Tied 0.63% of the time
Losing 61.81% of the time(3.11% with trips or better)