The helpline for Challenge Xtreme is 0845 4505299, they're rubbish at starting, mine is 2 weeks old and it took me 20 attempts ( no kidding ) to fire it up, very prone to flooding. In that time I could have cut the grass twice with my £25 electric mower from B&Q. Previously had a Briggs and Stratton, it was fantastic.
Alan Titchmarsh jr, May 2013