Having chatted to local mechanic he too suspects the lack of the tank to breathe. Cant see any way to remove the ball bearings but will have a good look. Cut open and inspected the fuel filter. Learnt its ok to blow through the fuel filter but sucking is a silly thing to do. Little bit of rubbish on the tank side of the filter (need new filter now I have cut it open.) Tried blowing past the ball bearing from both sides but to no avail. Definatelt lack of air. Get a good old hiss when I open the cap. I suppose drilling out the ball bearing is not acceptable on a race bike. Cheers Mark |