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.

Rodger wrote on 11/24/16 at 14:57:37:


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.

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

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).

@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.

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.