right i know peeps take these out, so first of all, what are the advantages of doin this and how hard is it? cheers

The advantage is the obvious one of a lighter valvetrain - less rotating weight..

I have done this to my racebike - no idea if it works as it is still being built..

To take them off you need some circlip pliers or strong neeldes nose pliers.

Of course - there is a proper way to do this which costs money and require experience or there is the bodged way in which you whip them out and see if it runs - like my way!

I know Stickshift and Simon Ed have theirs out - they don't report any blowups...

when we did it with mine we took all of them out.we reckon it gives maybe 1 or 2 bhp by doing it. They were easy to take off apart from the ones that run off the crank but an angle grinder took care of that. To be honest there should be no reliability issues unless you don't do it correctly. They were taken out in november 2006 and its done half a dozen trackdays and 10 meetings and not had any issues at all.This is what it sounds like when its all done

http://www.youtube.com/watch?v=377u7DEGFN0" onclick="window.open(this.href);return false;

sounds good might be summin ill look into then cheers i knew you had urs done simon just wasa wonderin what effects it had