The first series Model 5.Can't remember and don't have access to my books or paper work but I think it may be a series 2 engine on it.Don't quote me on that as I said I don't have my books or paper work,so I could be wrong. Either way good find and yes they don't take much to run.If it is noisy it maybe doesn't have a baffler in the muffler.Just beware if you decide to pull it apart under the base where the engine bolts to the chassis there is a metal plate,under that if you find a fibre gasket just be careful as the original ones were made of asbestos.I just put them in a plastic bag and bin them straight away, trying not to to create any dust from it.
