Just saw a wikipedia link to us...

Is "Happy Times" a nickname created on this forum?

The environmental effects of motorized bicycles varies according to the power source.

Old inefficient Two stroke engines, common in those powered by internal combustion engines ("Happy Time" made-in-China two strokes are still dirty like the old ones) , often emitted more pollution than automobiles due to partial combustion of the upper cylinder lubricant necessarily included in the fuel (this is not the case with newer 2 stroke motors such as the Tanaka "Pure Fire"). One Swedish study found that running the older inefficient 2-stroke lawnmower for half an hour pollutes as much as a 150 km trip in an average car.[10]. Fortunately those older two strokes are not in common usage on motorized bicycles having been replaced by super clean four stroke engines (such as the Robin Subaru EHO35 and EHO25), and clean two strokes such as the Tanaka (Pure fire) engines.
 
I think they got called "Happy Times" for the same reason bald people get called curly.
 
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