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I beg to differ Warwick.
Most of the reed valves on 2-stroke bikes are still steel (the ones I have seen anyway) and the chnces of a reed breaking are very, very slim. Even with a reed valve piston port timing is used (you have no choice) as the exhaust port must be closed before the transfer slot is opened (ok, slight overlap, but still) the reed valve simply stops the charge from escaping back up the inlet tract.
Supercharged, 2-stroke diesel motor (General Motors engine, aka Jimmy) Have valves like a 4-stroke motor, as the fuel (being compression ignition) is injected at the top of the stroke, thus no need for the complicated transfer porting.
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