About a year ago, I switched from coaster brake wheels on my Mosh Bmx to riding brakeless with a freewheel hub. Ever since, my life has been HELL. At the bottom of every stroke, there is a loud clicking noise that sounds like my bike being hit by a screwdriver or something, and i can feel the click on my feet. I've changed the freewheel, then the bearings in the crank, then the chainwheel, then the back wheel. I basically have replaced everything on the back of the bike to no good effect.
Can someone tell me what might be causing this? I checked the chain but it seems not to be worn. I will replace that if anyone thinks it will help.