If a simple maintenance task like that was neglected, I hate to think what your rear end gears look like.
I think I would check there soon.
Jim
Jim, I already have the rear wheel out. It was so well maintained, loads of grease of the right type, the front axle was the same. That is why I was rather surprised at the state of the air filter. It seems as though the easy things were maintained and the difficult things forgotten about. The bike is just about stripped and I have started painting and cleaning bits today.