I was giving the bike a deep clean when I noticed a black rubber hose, loose and blanked off at one end dangling near the RHS foot rest.
The part number is: 5K-E443E-00.
It is about 30cm long, connected to a unit to which the clear short tube is also connectedand the other end is blanked off with a plug.

Does anyone knows what this is for and is it supposed to be let loose in hat area?

Lol I've seen this before lol and wondered that myself

Air box water drain?

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Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen

don't know pal, there is a plug in at the loose end which would need to be removed for draining.

interesting

I would assume you're talking about the " air box (oil) drain".

Forgive me my lack of technical detail but afaik it works a bit like this: When your engine cylinder is pushed downwards, it pushes away all the air ( and oil) underneath it. This pressure build up has to go somewhere so this air/oil mixture goes to your "breather". A little black box that seperates this mixture again and allow the oil to flow back in to the engine compartment. However, when revs remain high for a while ( long motorway drives?), this breather can't hold it all and it "overflows" into your "air box" where your air filter is. If you open up the air filter box, you could be able to see the entrance of this tube. Normally the air/oil would be sucked again in the engine and burned. However a little bit can stay behind and drip down. Hence, a little drain tube...

Should you be worried? No ...

Should you look at it from time to time? Yes of course.

for example:After a 2000km holiday ( in 6 days) with lot of constant high revs, I lost about 5 centilitres.. With normal rides, it's hardly worth mentionning

edit :

This one? After my holiday ( and not looking at if way to many km's )




I have another pictures of the opened up air box, but the phote won't upload..will try again later if needed

Yeah should pull the bung out from time to time to drain it ..... also theres one on the kickstand side of the air box point forward ... normaly see through . That should be draind from time to time aswell

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Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen