In the process of talking to the Balmar
team, but it seems my crank pulley is not the "standard" pulley. It is the "optional" pulley from what we can tell.
Mine has 6 bolt holes rather than 4. I've reached out to Yanmar
to see if they can provide a list of engines that also use this same "optional" pulley so that Balmar can make find a fit for me.