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Old 02-28-2011, 09:10 AM   #17
The Griz
North Forest Rider
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Joined: Nov 2008
Location: Minnesota
Oddometer: 3,787
Originally Posted by jamesdemien View Post
Is it really better or are we just sticking it to the man?
It's only better if you're having runnability problems. If your bike runs fine and you haven't had any problems then there's really no need to remove the charcoal canister. Do you have a 2011 F800GS? I would be willing to bet that the charcoal canister recall work has already been done on your bike if it is a late 2010 or 2011, making it even more pointless to remove the charcoal canister.

Remember, it does serve a purpose. Even though there are countries that don't require them, we do here in the USA due to our EPA laws. It's purpose is to keep purged fuel liquid and vapors that exit from the gas tank vent line from evaporating into the atmosphere. A little known fact is that evaporating gasoline fumes/gases are in effect many many times worse for our atmosphere and the creatures that live within it than even exhaust gases. This is why it is so important to the EPA lately for all internal combustion vehicles to have a charcoal canister system.
It captures fuel vapors and prevents them from escaping to the atmosphere and then stores the fumes and recycles them to the fuel tank or engine intake for combustion as needed. The long and short of it is that it helps to protect the environment and improve fuel economy.

All that said, in the first 2 years or so of production on the USA F800GS and F650GS2's, BMW pretty much screwed up the routing on the hoses, so that if you rode through rain or standing water, the system would suck water up into the charcoal canister. This in turn would clog air/vapor flow through the charcoal canister, wreaking havoc on the very finely tuned pressurized fuel delivery system on this bike, causing stalling and runnability issues. However, BMW finally recognized their error and sent out recall notices and bulletins to check all hose routing for charcoal canisters.

Here's how BMW originally designed it:

Red is outside air flow and blue is fuel vapor flow:

Then, in a recall bulletin, here's how they've fixed the issue:

Adding a Y-fitting, they added a line to the ground vent hose that goes up high into the bike, so that when the engine/throttle bodies are sucking in fuel vapors from the canister to be burned off they don't also suck in water from the ground or from rain:
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