Quote:
Originally Posted by cRiPpLe_rOoStEr
It used to be a more critical issue, but nowadays most resort to a charcoal canister just like cars have been doing for a long time.
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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. In a year, a motorcycle sitting in a garage not going anywhere pollutes as much as driving a Honda Accord 14,600 miles.
Carbureted motorcycles are much worse than EFI motorcycles because the float bowl is open to the air.