Yamaha 3WS unknown hose on cylinder head
 

Hi, I'm new here and also new to yamaha XT.
I have bit of a problem with my XT 500 3WS, I bought it recently and it came with slight oil problem. Problem was that oil was leaking from nipple on top of cylinder head shown in picture below, would any of you know where should it be connected? Or if it is breather hose? which I'm not sure because I feel like there is more oil coming out than it should from breather.
Thanks to all in advance.
https://imgur.com/a/8Q33PYm
https://imgur.com/a/8Q33PYm

hi
just a guess, without good knowledge of xt500s' - maybe it's for an overflow hose coming from the oil tank? if so, must be connected to the tank, somewhere around top..
as for oil amount, sounds pretty possible - along with general pressure, camshaft seems just below..

I don't see any opening tho, there are two hoses already connected to oil tank nothing on bottom tank or top and none T connector on any other hose around engine, maybe someone changed overflow hose and is now missing connector?

maybe...
anyways, it's somehow strange place for the breather.
hopefully, someone aware of xt500s will give a better answer..

your bike is essentially a reduced displacement xt600, so download the workshop manual for the 600, it will serve 99% of your needs.



top of the valve cover is actually a common place for for breathers on many bikes, and of course, should be connected to a tube, otherwise it will shoot oil vapor all over.


some markets had different emissions solutions for engine breathers, so what was done on the 600 might not apply to the 500


with all the red silicon i see on the tappet covers i can assure that previous owner was NOT a genius mechanic, so might have left important stuff disconnected, or even throw away a T joint for that tube


if you dont find in the manual a specification to where the tube should go, try to mc giver some solution so it does go into the airbox. it just needs to vent there the oil vapors, its not holding pressure, so not rocket science to solve.