Canister under rear of seat?

[willowstreetguzziguy]

What does the canister do that is located under the rear tail section of my 1200 sport?

[Dr. Enzo Toma]

Can you tell what's plumbed into it? I'm not familiar with the 1200 sport, but a plastic canister on a motorcycle is often a charcoal canister as part of the EVAP system so that your fuel tank doesn't vent to the atmosphere and smell of gasoline fumes, or perhaps a breather box for engine blow-by.

[willowstreetguzziguy]

I believe it’s the charcoal evaporator canister. What is its purpose?

[guzzisteve]

It cleans all the gases that don't get burnt, fuel & oil goes through there. Most  are disconnected to avoid runability issues.

[Dr. Enzo Toma]

If it is a EVAP charcoal canister, then yeah, it absorbs fuel vapors so they don't vent into the atmosphere. Most modern vehicles have them as emissions controls. Unless the system is not functioning (easy to clog if you overfill the fuel tank), they don't tend to be a determent to performance and are often worth leaving in place just so if you park in a garage it doesn't fill the space with the smell of gasoline.

[Wayne Orwig]

The fuel tank vents fumes into it. They are collected un the charcoal inside. Another line goes to the intake and vacuums the fumes into the motor and burns them.

The good, the fuels system stays somewhat 'sealed' so the gasoline in the tank does not go bad as fast as an opened tank.

The bad, if you overfill the tank, raw gasoline can saturate the canister and you end up with a poor running motor until the raw fuel gets vacuumed out.