when the cam is off lift the valve is open ever so slightly only on a few and just to add thers no bent valves..
has any one seen a hydraulics lifter hold open a valve on a cossy head I went to see for my self head was rebuilt with new valve guides and seals and skim and new double valve spring and new hydraulics in but 2 valve are get held open a bit and if you take the cams out they close its using bd16 s I can only put it down to the lifters as the valves are std size and were the old ones before

 

If the tappet has stuck mate then yes it will hold the valve open a little

I have had this before , the center of the tappet had jammed , and this is what pushes on the valve , and so wont shut and let the valve seat back in the head

 

Not heared of this before on a YB but someone may be able to answere your question for you

If its been skimmed etc has the machinist sunk the valve seats ? thus causing the valve's to protude further on the cam side ?

Just a stab in the dark mate



Regards Doug .

 

If its only two, try swoping them about se if they do it in other places

 

Damo V
well i went round and i took the cams out and refitted the cams and spun the cams round a good few times and they all shut ..now i have taken the cams out and soked the lifters in oil for 20 mins and re fitted every thing and a few is valves are open its ok if you keep spining the cam and the lifer drains its oil out then they all shut

 

Doug
thats what i siad but i brought down 2 new valves with me and fitted them only to find they do the same thing i did also swap round the lifters and valve springs and retainers still same

 

NORTH YORKS RS SPARES
thank you but its not that i was able to take lifters out and put them in with easy