Info for 899,959,V2,1199,1299 owners

lotus7 · Oct 26, 2020

Taking my bike apart for first valve inspection and found something annoying in regards to having our engines only consuming clean,filtered air.Looks like there is some kind of "drain hose"that goes from the bottom left side of the air box down behind the battery and then goes through the radiator fan shroud and terminates just on the inside of the shroud.Looking at the end of it,it is a small,open slot (I guess to let some liquid from the air box out?).If your rad fan is on that would be positive pressure on that end of the hose and negative pressure on the other end in the air box meaning any dust,dirt get blown/sucked into the air box and into the engine.I'm Assuming all the panigale twin engines have this hose.I'm going to plug it or put some kind of mini inline filter in the hose.Attached is picture of removable end piece and a picture in the dark of the end piece on top of flashlight.

trooper3 · Oct 26, 2020

That slit in the end of the "duckbill" acts as a one way check valve. With vacuum in the air box the lips close together, sealing the opening from pulling in outside air, whereas with any positive (or no) pressure in the airbox the box is free to drain or pulse out any particles or condensation/oil etc through the slit. Pretty common valve. However, if the rubber has hardened or the lips are damaged the valve will not work and should be replaced.

Here is a little more detail: Duckbill Valves, How they work!

lotus7 · Oct 26, 2020

Thanks Trooper 3 for the quick and knowledgeable reply.That makes sense.After reading your reply I tried sucking on the valve as well as using a shop vac and it doesn't seal.(but I could see that it would if the rubber was softer)The bike is 5 years old and the rubber is not as flexible as it once was I guess.Ill try soaking it in armor all or something like that to try to bring it back to life.Perhaps buy a replacement if that fails.Either way I'm putting a small filter in the line.

trooper3 · Oct 27, 2020

From the pictures you took it looked like the slit was too wide open and "stuck". The rubber hardens with age, temperature and ozone exposure and it appears, based on your testing, that yours has failed. Glad what I said made sense. Sometimes being an old engineer and gear head has some merit, however as senility sets in, you forget most of them.

Info for 899,959,V2,1199,1299 owners

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