Vintage and Classic Hondas

What part is this?

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Melderkin326

What part is this?

I have a 1980 honda cb750k and I was taking the air box and noticed that there was a smaller black box under the battery box and there was a small tube going from the air box to this little black box and then the other end of the little black box there's a tube going somewhere underneath the bike. what is this box and what is? its function

TOOLS1

Re: What part is this?

Administrator

That is an oil/water separator in the crankcase ventilation system. The tube going under the bike is the drain, and should be drained at least once a year.
TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
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LukeM

Re: What part is this?

Administrator

In reply to this post by Melderkin326

I believe that's a breather/accumulator used to take crankcase vapors and feed them back to the airbox. Think of a PCV system for a car. The tank is used to collect the really drippy stuff. The maintenance on it is to remove the plug in the end of the hose, and drain the tank about every month or so.

D/L the FSM from the home page, and it should talk about it in the Maintenance section.

Luke M

Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.

Melderkin326

Re: What part is this?

In reply to this post by TOOLS1

When I disconnected the hose to the small box it was full of water should I drink all of it out?

TOOLS1

Re: What part is this?

Administrator

Only if mixed with Scotch.

TOOLS

Melderkin326

Re: What part is this?

It tasted horrible and it was very oily. Now should I drain the oil water separator so its dry inside or leave the water inside of it?

TOOLS1

Re: What part is this?

Administrator

Only if your still thirsty, or sober.
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seestheday

Re: What part is this?

LOL, is this a troll?

If so, well done sir, well done. You got me.

1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals

My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.