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Is a catch can a benefit?
A catch can provides 2 functions:
1) it's a bit more environmentally friendly
2) it provides a vent "maze", where stuff is slower to go out, and conversely, it slows up stuff from going in.
Motorcycles all vented directly to the atmosphere before the foolishness started. Probably an air filter of some kind would be a better choice, K+N makes one, for $22 (wasn't worth $22 to me). Maybe a piece of foam retained by an elastic band? But if you think about it: the oil vapor trying to escape would coat the tube walls and trap most stuff trying to invade. I could see making the great effort (or spending the $22) if you were operating under dusty conditions, but under most operating conditions it should be ok.
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