No, no, if you defeat the stock engine breather/filter, the hose should be routed up near or above the speedometer/tach, so you get the same benefits of air quality as the rest of the population.
I've seen you make this argument before. Does the volume of gasses coming out the breather even compare to the gasses coming out of an otherwise well-running engine (in terms of CO2, CO, hydrocarbons, particulates)? My instinct tells me it would be negligible and thus have no significant impact on the overall air quality impact of a motorcycle. But I really don't know the answer.
The engine breather emits about 10-20% of the pollutants from an I.C. engine. The variation stems from the condition of the piston/ring/cylinder fit, and the pressure differential between the combustion chamber and the crankcase chamber. This fit varies with the temperature of the engine (which is unregulated in the SOHC4 air cooled engine). Anything that leaks past the rings goes into the crankcase. Some of the combustion contents contaminates the oil supply and the rest exits the breather tube. Although pure water does condense inside the engine and the breather tube, it is contaminated before exit by both the contents of the blow by gasses and the oil vapor hydrocarbons, almost all of it unburned. If you think the water that drips out the breather tube is simply water, then I invite you to taste it. I assure you the taste is NOT that of pure water.
The Hydrocarbons (burnt and unburnt), CO, NOx, and atomized droplets of oil, can easily be prevented from dripping on the ground and polluting the breathable atmosphere, by simply routing these vapors and gasses back to the engine to be re-burned. This not only benefits breathing mammals on this planet, but the engine itself, though reduced contamination of the oil supply. For the SOHC4, the slight vacuum applied to the crankcase serves to help the ring seal. It's most definitely a win-win, to have it and a loss for everyone to defeat it.
Cheers,
