I went down to Repco and picked up some spark plugs and a fuel filter. Spent a while installing them but still no change. Hopefully it’s the timing or a blocked jet but I’m starting to wonder if it’s not something much much worse :(
Looks like I’ll have to organise towing down to Mentone where Rank Rotaries are (recommended by the guys at AllMaz). Guess we’ll find out soon enough…