It is complete air cleaner kit including OSR base.
OSR is an Oil separating and Recirculation system.
It separates off oil mist from blow-by gas in an air cleaner base and recircurlate only gas.
It also works as a carburetor support, so you don't need anything else.
There are 4 type of base according to models and years. Please choose your type in the box below.
OSR is a patented system in JAPAN since Nov,2011.