Honda says to tension the camchain when the crank is 15deg. after TDC on cyl. @1....If your at TDC ( 'T' mark) on #1 cylinder, both rocker arms will be loose ( need to unscrew the caps on #1 to check )..... When the crank is at 15deg. past( after) TDC, the pivot for the advancer arm will be visible thru' the timing 'hole' in the points plate....