Lean runaway scenario on a motor

[Ixion]

It is simply an air leak after the carby that causes a lean runaway.

Worn slide can do it, too. But I think there have to be other factors, like maybe a worn needle jet, an air leak in itself won't cause a true runaway (will cause racing, but not the true 'rev till it blows'). Also I think it needs either a carboned up cylinder or something of that nature to cause a hot spot ti keep igniting the mixture after the ignition is switched off (the lean mixture will make the carbon red hot )

[rocketman1]

Mate I would have money to see that happen, geeze it must have been funny!!!