I have a fix but its also a big warning to others. This whole thing started when I accidently removed the fitting located below the carbies thinking it was the thermostat housing due to the way it looks. Its not, its where the water enters the engine after cooling. The thermostat is elsewhere. Never ever ever touch this fitting unless its leaking. By removing the 2 bolts and cracking the o'ring seal it also resulted in movement which affected another seal between the waterpipe and this fitting. (See picture 1) To replace this has been an absolute nightmare. The waterpipe is made of steel and cannot be removed at all from the bike without removing half the front of the engine regardless of all below attempts. You can however get some extra movement by removing the bolt holding it in place. This bolt is located in front and above the oil filter (see picture 2) again it was designed not to be removed without half the engine missing. To get a 20mm bolt out of a 12mm space I had to undo as much of the waterpipe bolt until its length meet the casting in front then hacksaw it in half, then remove the remaining bolt with longnose pliers. This gave me just movement to pull the pipe and fitting apart exposing a rubber seal that was hard, brittle and no longer capable of keeping coolant under pressure (see picture 4). The seal is another part not stocked in Aust so found one online and about 2 weeks from the UK so I ordered 2 of them today just in case. I did a test run of the re install process. I knew that the bolt I removed needed to somehow be replaced so I manufactured a new one from a SS304 M6 bolt I had (see picture 3) you can see how much bench grinding was needed but the bolt has the smallest head for a spanner to just keep a grip but just enough thread to comfortably hang onto and still be installed in a restricted area. ). Luckily this bolt can be short as it does not need to be torqued and is purely to hold the pipe in alignment. If I had left the original part in place I would not have needed to go to this trouble BUT if it was leaking then this long process is easier than removing half the engine. Im hoping to have this ready for its maiden start up in about 3 weeks.