what a load of cr*p the last bloke said !you cannot service the waterpump itself its a sealed unit it is held on by four screws around the edge of it (ITS ON THE RIGHT HAND SIDE OF THE ENGINE AS YIOU SIT ON THE BIKE)also you will have to remove the waterpipes which are attached to it with hose clamps .get a new one or secondhand one from partsearch uk 09061119999 then refit in reverse order making sure you line up the holes in the drive wheel of the pump with the pegs on the magneto on the engine ,run the engine with the header tank bottle cap off with it full to the max mark to make sure it has no air in the system 50/50 mix of antifreeze and water you can also squeeze the waterpipes to help move the air to the top of the bottle ok good luck with it ,adam,
adam, December 2005