A Polly II to John Clarke's ever-popular design. I've sold more Pollys to beginners than any other kind of engine - provided you like the looks they are easy to drive, fire and look after, most seem to go on forever. My eldest son learned to drive on a Polly I, it regularly used to come off the end of the portable track and plough along axle deep in the grass, seemingly with no long term ill effects.
gauge | 5 inch |