This reminds me of a friend from school who rode a borrowed 2 stroke scooter to go on a trip which resulted in an accident and serious permanent injuries…
As written by someone else:
It was a Saturday in July, the weather was very hot and dry and Steve had been invited to join several of his friends on a run down to Brighton. I think most of his friends were on Scooters and, one friend had recently brought a second hand Vespa px200 and, this was the Scooter that had been lent to Steve for the ride to Brighton.
During the ride, the Scooter’s engine seized causing the rear wheel to lock up and swing violently from side to side until control was lost and throwing Steve into the road. The vehicle, which was following Steve, a car, braked immediately pulling up quickly, but from behind the car emerged a motorcycle. The motor cycle, a Suzuki GSX 600R, it is assumed to avoid the braking car, veered to the right and overtook the car, rode towards Steve who was positioned in the path of the motorcycle. The motorcycle made contact with Steve’s head and, the rider was thrown into the road also.
What caused the engine to seize?
I think most Vespa scooter engines are of Two-stroke configuration, which mean they rely on an oil/fuel mix ratio for lubrication of moving engine parts and don’t have an independent oil sump to draw oil from for lubrication. If the ratio is incorrect, for example insufficient oil to fuel, then those moving Engine parts will be deficient in lubricating oil deposits. Together with an incorrect oil/fuel mixture and a hot day, the potential for an engine seizure is possible!