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The black plastic knob is the idle adjuster and the canister is for pollution control I believe. We don't have the canister here in Oz.


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We don't have that in Europe's bikes either. My car does, and it's a canister full of charcoal that absorbs unburned hydrocarbons emanating from the fuel tank in the form of gas vapours. The computer chooses certain times and conditions to empty the canister into the engine for those fumes to be burned. They call it "purging".
 
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