
Thought I would share what I found today on my 2011 Husqvarna TC 250. I searched the forum but couldn't find any previous cases.
So, this afternoon i started the bike up after a long lay up to warm the oil before i carried out an oil change. After 10 minutes I came back to the bike and felt the rad to check the bike was hot, the rads were cold

I pulled out the water pump assembly and i could see the impeller was not rotating with the shaft. I split the pump and found the nut had come off the shaft, the inner boss of the impeller had separated and disappeared. The impeller was rattling around the water pump housing.
With a race tomorrow i naturally panicked. I run the only Husqvarna in our club, and probably the only X-lite in the Channel Islands so a replacement part was out of the question.
In the end I packed the centre of the impeller with neatly fitting washers. A washer under and on top of the impeller and a new nut on the shaft. It looked ok but if the nut rattled off that would be my bike and my season finished. I have zero welding experience but i thought it was the only way to make sure the nut wouldn't loosen. With no mask I had to hit and hope but it seems to have done the job.
Finger's crossed it lasts the meeting. Anyone else had this problem? Also taking bets on where the impeller boss has ended up??