Removing FSZ600 Cylinder head with engine in Situ

[Craiginuk]

Finally got head back together and on. Lapped all the valves too while i had it off.  But i'm having problems with the timing chain. When i tried to install tensioner it is tight even before i install spring. Did not want to force anything so slowly turned over on crank via magneto bolt. The engine bottom end turns over but cams aren't moving.


If i stick my finger against the guide where the tensioner should sit, i can feel the chain  or something moving i.e can feel something scraping. Is it possible the chain has come off the sprocket at the bottom?


Any ideas before i set fire to it?