I was informed by the local YAMAHA dealer that my starting problem was a bad earth lead where connected to the engine. They said it was a common problem.
I cleaned it well and the Bulldog started ok.
After two weeks not using the bike it will not start again.
I will use a car starter lead to bypass the earth as I did last time, to start it. Then if it starts I will clean the earth connection at the engine again.
I am asking has anybody else had the same problem and what I can do to fix it.
I am replying to my own problem of starting.
It was a faulty battery. Only drawing 7 amps when trying to start.
A new battery has fixed it