I need to remove the single groove pulley on my 84 Westy 1.9, and need some
advise.  Bentley is vague and archives don't seem to have it.  Does anyone
know what size bolt it is holding it on, and is there a good technique for
preventing the crank from turning while removing the bolt.  There is an
access hole on the upper left side of the engine case where I can see the
flywheel, but it's not as accessible as it seems ( it's hard to get an
upwards angle) and I can't seem to access the flywheel teeth.  Any
suggestions?  TIA

Scott