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Originally Posted by JSH
Motorcycles have EVAP systems today but they are primitive. In the USA motorcycles are allowed to leak 2 grams of hydrocarbons per day. A Honda Accord with the 1.5L engine produces 0.05 grams HC per mile. So a motorcycle can leak as much HC as driving an Accord 40 miles every day.
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I don't remember the exact emission limits in my country, but motorcycles have been at least one step behind automobiles now.
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Carbureted motorcycles are much worse than EFI motorcycles because the float bowl is open to the air.
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AFAIK only a handful of Chinese motorcycles are still fitted with carburettors in Brazil, but they must comply to the same standards applied to the ones with EFI.