Hmmm, wish I could check my timing chain tension on the GN
... from the looks of it I'd have to remove the cylinder head cover and that holds the valve rockers and camshaft in (I think) ...
One day I'll find out I guess.
Pete
ps: It amazes me how manufacturers seem to have weaknesses in their particular area ... you would think once they have had trouble a couple of times they would just buy a competition's example and then copy ...