I'd imagine you have a blocked circuit, and the fluid has been dumped out of the overflow pipe of the expansion tank.
Drain the system and put a hose on the top to push any gunk out, then get some Radflush from Halfords, add and fill up with water, including the correct level in the expansion tank, and i'd personally leave it in and run the bike with it for 3 days to give it a proper clean up. Then flush the system and re-fill with a good pre-mixed motorcycle coolant.
It's more than likely that the Radweld has clogged up the finer pipes, so there's a small chance you'll fix one problem but open up another, so may end up replacing something! There's a strong chance that the pipes that form your carb heater circuit will be blocked too, which is not really a problem now but can cause you problems like carb icing in winter. I doubt very much that Radflush will clear them as the pipes are quite narrow.
Obviously replace the parts you think are knackered firstly.
With any luck you may get away with it.
Drain the system and put a hose on the top to push any gunk out, then get some Radflush from Halfords, add and fill up with water, including the correct level in the expansion tank, and i'd personally leave it in and run the bike with it for 3 days to give it a proper clean up. Then flush the system and re-fill with a good pre-mixed motorcycle coolant.
It's more than likely that the Radweld has clogged up the finer pipes, so there's a small chance you'll fix one problem but open up another, so may end up replacing something! There's a strong chance that the pipes that form your carb heater circuit will be blocked too, which is not really a problem now but can cause you problems like carb icing in winter. I doubt very much that Radflush will clear them as the pipes are quite narrow.
Obviously replace the parts you think are knackered firstly.
With any luck you may get away with it.
More people are born because of alcohol than will ever die from it.