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Originally Posted by PaleMelanesian
It was a new episode last night, so likely not available elsewhere, yet.
The bikes were progressively cleaner by date - the 80's bike was the worst. The new 2010 Yamaha 250 was the cleanest bike, and proportionally cleaner with the aero fairing. That's good news. I believe it is fuel injected. Still no catalytic converter I believe, so that's where the emissions came from.
Not sure if it was by total emissions or by percent. Still, even if it was by percent it comes out as worse. At maybe 1/2 the car's fuel consumption but 5x (by percent) the emissions, that's still 2.5x total output. If it was total, that's WAY worse.
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They specifically mentioned that they chose the bike because it was small displacement, fuel injected, and had a catalytic converter.
Cats started showing up on bikes shortly after EFI. My '06 Ninja 650R has EFI and a cat. Although, I don't think the regulations are as strict for bikes and cats though. There is no testing that I am aware of and all the exhaust systems I've seen don't have cats, so I have to assume that it's not illegal to remove them like it is with a car.
Their measurements were in absolute numbers, not percentages. They did compare these numbers later as a percentage of the cars emissions though. The '00s bike's CO and NOx emissions were like 3000% and 8000% of the '00s car's but not because the bike was high, only because the car was essentially 0.