welll, just by removing the cams you shoudl be able to see a fair amount of whats goin on in there
but before you remove the cams just check all the valve clearances and make sure its not just a shim worn down too much...
with the cams off you should be able to inspect for any damage to spings and shims.
now, even if you get valve springs out with head on, how do you intend on putting it back together?
but, if you must remove them with the head on, the way i would do it is with piston of cylinder ur working on away from top of the stroke, take a socket 12 or 14 mm i think worked when i did this on my 1g head coz the valve spring compressor wouldnt fit around the head, but i digress, take afore mentioned socket, and sit on the spring retainer thingy, and hit it with a hammer, this makes the collets fall out and releases the valve spring (dont lose the collets!)
and then you can jus removing everything
but why you woudnt remove the head is beyond me...
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