The crankcase breather ideally should go to a closed-circuit can. But some people juts let theirs stay open to the air, but if you do that, it will leak oil.
I use a catch can and I don't re-circulate the oil condensate, as the process of condesation of oil produces high amounts of h2so4, so I like to keep it separate. I made my can from an 8oz water bottle and an automotive oil breather filter.
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2011 Roketa MC-23-150
4T 150cc 157 qmj
24mm carb w 115 main jet and paper cone air filter
Manual petcock w Tygon fuel lines
Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust
RED spring clutch
Adjustable CDI (brand unknown, it's blue and red and works great!)
KOSO high performance variator w 12g sliders
Gates Powerlink 835-20-30 belt
GPS verified 65mph on flats.
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