to pull the fly wheel,do ihave to take the hole left side of the case off including the circle part.iam trying to install igntion advance key from curtice sparks.if some one has done this before please help ,what size allen does it take on the side cover.helpplease .thanks in advance

 

4mm I think ,hey ied like to warn you of the advance key ,it makes starting harder ,and takes away bottom end power,it only help's on mid and high rpm's