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Message started by Redryder652 on 11/24/16 at 13:37:39

Title: Airbox drain tube
Post by Redryder652 on 11/24/16 at 13:37:39

So I've had my bike for about 2 years now, and in that time ive put on about 17xxx miles and some one mentioned an airbox drain tube with a cap at the end of it, I checked my bike and it was not there, should I worry about it or leave it the way it is. Also, where could I get another plug?

Happy thanksgiving by the way everyone.

Title: Re: Airbox drain tube
Post by Rodger on 11/24/16 at 14:57:37

2 quick questions:

Did you buy the bike new or used?

Have any modifications been made to the airbox/filter?

Will try to get a good photo for you.

Title: Re: Airbox drain tube
Post by Redryder652 on 11/24/16 at 15:12:59

5D5345474F49422A0 wrote:

2 quick questions:

Did you buy the bike new or used?

Have any modifications been made to the airbox/filter?

Will try to get a good photo for you.

Air box and filter are stock, no mods, I replaced the filter about a year ago with a hiflofiltro (stock style) and I bought the Bike used with 1200 miles on it.

Title: Re: Airbox drain tube
Post by Rodger on 11/24/16 at 15:43:34

I removed the front pulley cover and took this photo. On the left side of the bike at about the 4-5 o'clock position from front drive belt pulley, you'll see a hose with plug.

Let me know if pic came through ok.

Title: Re: Airbox drain tube
Post by Redryder652 on 11/24/16 at 15:52:56

I don't see a picture, try to pm it to me.

Title: Re: Airbox drain tube
Post by Redryder652 on 11/24/16 at 16:08:47

I see the picture now, my bike doesn't have it. However I might be able to rob one off of my old honda.

Title: Re: Airbox drain tube
Post by Rodger on 11/24/16 at 16:14:05

First one of these drains (aka "puke tube") I encountered was on my '82 Honda CM450C.

You can see an exploded diagram on BikeBandit. Put in your bike's info for OEM parts, select "fuel & air," then "air cleaner." (Item #13, I think, for the drain tube assembly).

Title: Re: Airbox drain tube
Post by Armen on 11/25/16 at 05:57:05

IIRC, the hose is downstream of the air filter, so unfiltered air is going into the airbox through the hole.
Also, the stuff that pours out of that drain is really toxic.

Title: Re: Airbox drain tube
Post by Rodger on 11/25/16 at 06:47:00

@Armen:

I think you're right about the drain tube being "downstream" from the air filter element, as is the tube which runs from the engine to the top of the airbox. If memory serves, it's an emmisions control that routes crankcase vapors to the combustion chamber rather than to the atmosphere, similar in function to the EGR systems on automobiles.

I don't know about toxicity, however. The drainage would be a combination of oil mist, condensation, and combustion by-products.

Title: Re: Airbox drain tube
Post by Armen on 11/25/16 at 07:51:18

Roger,
FWIW, when I worked at a Honda dealer in the '70s, they sent out a service bulletin saying that crap was the most carcinogenic stuff in the bike. Nitrile gloves are your friend ;)

The breather hose on top of the motor routes fumes to the airbox, hopefully to be burned. The stuff that condenses sits on the bottom of the airbox and ends up in that tube.

Title: Re: Airbox drain tube
Post by Rodger on 11/25/16 at 08:22:55

Thanks for the heads-up, Armen. I recently did the break-in service on my S40, including pulling the plug on that drain tube. Nothing drained, but will get some nitrile gloves at Harb Freight.