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The pic below shows what my vent tube out of the oil tank goes into. Obviously, my Norton is not a restoration. The tube from the oil tank goes into that little air compressor water filter catch can in front of the shock. You can't see the vent tube from the oil tank in this pic. As long as the catch can does not fill to the top no froth gets to the conical filter at the end of the run, only air gets through. The catch can has always gotten some froth in it even day one after a fresh rebuild. It gets a lot less froth in it if I short shift and ride at the speed limit on city streets. Once I get over 60mph in 3rd, or cruise at HWY speeds, which around here are 70mph in 4th it starts to get some noticeable froth in it. The froth in the catch can in the pic is from 12 miles of riding, 1 mile of it at 90mph in 4th. When on longer spirited rides the catch can fills up over 1/2 way to the sintered filter and starts to gurgle. I have to empty it after 200 to 300 miles depending on how childlike I ride. The sintered filter in the catch can has 8 holes drilled in it to keep the air flowing out.


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All my crank revolutions must be the first few. Otherwise, that canister would be empty, right? ;)


One of the engineers here want to tell me what impending doom awaits because that froth is in my catch can, and not in my oil tank?


Do Commandos have froth towers on the oil tank, or does that froth get recirculated in the oil? Or are Commandos immune to creating froth?


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