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Old 14th October 2013, 22:10
G-CPTN G-CPTN is offline  
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Join Date: Sep 2008
Location: Tynedale
Age: 79
Posts: 3,698
The DDAD engine is, of course, a two-stroke, and will 'happily' run backwards as well as forwards (for example if you muff-up a hill-start).

Be warned that once this happens it will not respond to the throttle-pedal, and, unless you 'pull the emergency' flap (which places a plate over the inlet) it will 'smoke' as it starts to consume the sump-oil and engine speed will increase until the engine overspeeds and destroys itself (and, possibly, you).

Under no circumstances should you ignore this advice (and make sure that any driver knows this) and make sure that you never drive the vehicle without the emergency flap being connected and operational.

It is surprisingly easy to twerk the engine into reverse (as stated, usually on hill-starting) and without the flap - you must get out and run!
The standard stop-control will have absolutely no effect.

If it smokes heavily it's about to blow!

You might be able to stall-it by selecting a gear and engaging the clutch (I never attempted that) but the big red handle is the only sure way.
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