i havn't got the correct tools to do it but this is how i get em out.

strip head, rockers & cam out -
then i get a ring spaner and put it thru the rocker cover onto the top of the spring. I get a small socket and put it on the ground and put the head ontop. The socket holds the valve shut. then with a moan and shove i leaver the valve open/depress spring and remove collets. I can get it first or second try but first time took about half an hour of moans and yells to get them otu.

Might be an idea to put a old t-shirt over the head while your doing it only leaving a large enough gap to see what your doing. The collets tend to launch out of there sometimes if your spanner slips.

If you need more info i'll go take some photos soonish

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It's not a matter of money, it's a matter of hiding it from the wife.

I don't own a cheap chinese bike, it's an effing expensive one - but i love it!