The engines were fitted with a Pal Dynastart so you ran the engine backwards like a KR. Sadly my Dyna was broken, and the windings are of flat copper wire and no-one in UK could fix it even with a detailed diagram. I rigged up a starter motor feeding throuh an angle grinder's bevel gear head to turn a roller which could be pulled by a cable to press on the back wheel. Only good on reasonably level ground, and the rubber sleeve needed frequent replacing, so all added up to why I p-ex'd the Velorex for a Trojan...more liveable with.