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I'm about to plumb my 75 ironhead chopper and am wondering about my oil bag. There are 3 lines. An in, an out and a drain. Got the drain figured out, the out line goes to the oil pump (fully guessing) and where does the third one end up? Please let me know if you know, thanks a bunch!
 

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You should have 1 feed off the bottom and 2 in the top, one for the return and one for the vent as well as a drain. Feed to the oil pump, return from behind the rear cylinder and the vent should be on the rear/inside of the cam cover.
 

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Just behind the rear cylinder, and behind the kicker cover, on the right side ,in the motor case above the transmission, is a fitting, that is the return line. Not sure what oil bag you have, but some return/vent lines, have a pinched tube inside the bag. That is the vent, if you have one like that. If not, either one will work for vent or return.
 
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