Hi, about 2 weeks ago I noticed my gear-box oil had changed colour on my 2009 gas gas 125 to a very milky white colour, and my fan was making an unusually loud whining noise. I changed the oil but after about 10 mins riding it went to the same colour, so I headed home but on the way i noticed my bike was getting very hot, when I got home I checked my water level in the radiator and it was next to empty. I put the bike in the garage to sort another day. Last weekend Michael Brown told my dad that the water impellor would have gone, so took that off and the seal was also broken, We contacted my local dealer and got a new shaft, impellor and seals along with new gearbox oil, again after 10 mins the oil has gone white and milky and the bike is overheating, and this time the piston is making a large rattling noise, the fan has also stopped working now, but if you give the fan a push it will start going for about 20 seconds then stop.
Any ideas on what the problem could be?
Many thanks, Nick