Pull them off with a pliars , push on the new ones by hand, and as Bandit says, apply some engine oil to the seal inner and the top of the valve guide. Prior to pushing in the valve ensure the area of the valve where the collet locates is perfectly smooth and also the top of the stem. They can, but not always have burrs on them from use.

Ok so done a little bit of cleaning but while sealing the stems with blu-tac ( to stop crap going down them) I noticed on the very top (cam side) of the stem the exhaust side they are a bit sharp as you say may have burrs on. Intake are smooth...How do i smooth these out??.
Also rather than attack it with dremal my train of thought is hit all the crappy carboned up bits with wheel acid (wonder wheels) unless the are rubber seals inside the valve stems this shouldnt be a problem should it.
Thanks Gaz

Hi guys.... ive removed all the seals... Now apart from yamaha where is the best place to get these seals wemoto? ebay?.
Thanks Gaz

pictures would be a great help here,if you have removed the valve,collets and spring the seal will be next in line,simple push fit on/off , your not confusing seals with guides are you.....have a go at resizing the piccies and we can get you sorted 

Hi there im trying to do just that but im not too brill on computers.. could email you the image at all if cant upload it please??
Thanks Gaz

Thanks lads much appreciated

Hi do you have these to fit other bikes??

Hi guys Im a newish member as i think i used to be on here a few years ago... Im Gaz and from West-Mids/South Staffs..Im in the process of rebuilding the fazer "Street Fighter" style and will document its journey if anyone is interested to see