I would suspect the lift pump. Check the operating arm and pivots for wear. Check that the diaphram is sound and that the pump is delivering sufficient fuel at suitable pressure.
I had similar problem with my m/c. Would run normally, then begin to die finally stopping due to airlock. A new lift pump cured it. Not expensive, £18 about 5yrs. ago.
Mr.Toad
March 2010
howtomendit.com for free repair help, information and advice.
