mklotz70 Posted April 3, 2011 Report Share Posted April 3, 2011 I think the 620 m/c is a 7/8" bore. You can look them up on Rockauto or napaonline...they usually show the specs. The makes a difference in how the pedal feels. The drum 620 m/c should be pretty close to the same bore, keeping the feel pretty much the same. I've heard of guys running disc/disc m/c's on their drums. The random catching is probably something loose from being worn. I'm guessing it intermittently moves to where it catches. It might also be debris causing it to catch hard. Quote Link to comment
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