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I myself use a catch can I made myself out of an aluminum 8oz water bottle and a Mr Gasket oil-breather filter. My system works much the same way, but instead traps the small amount of condensed oil vapor, rather than return it to the oil system, to prevent excess h2so4 build up in the oil.
Since you are supposed to change oil regularly, it is rather a miniscule amount of sulfuric acid that would return to the oil system w the hamster bottle method, so the issue of a return or semi-closed system is a matter of personal preference.
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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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