2020 csc tt250

[NateTt250]

Where do these lines connect to? I think a few of them are mixed up but I can’t find a proper diagram for them or anything in videos. My bike isn’t starting at all and I’m not sure if this is the cause

[Thumper]

Looks like a vacuum line for you EGR valve. Not necessary, at least won't keep it from running. But if the vacuum source that plugs into is not plugged, it could make it hard to start.

[NateTt250]

Looks like a vacuum line for you EGR valve. Not necessary, at least won't keep it from running. But if the vacuum source that plugs into is not plugged, it could make it hard to start.

I’m pretty new to this and have no idea where they should be connected to

[superjocko]

The hose in your first photo is supposed to attach to a fitting on the intake manifold. The intake manifold is the black rubber piece between the cylinder head and the carburetor.

The fitting on the side of the carburetor is the float bowl vent. If the bike is equipped with an evaporative emissions canister, it connects to one of the fittings on the canister. The canister is a round black piece about the size of a regular can of soup and would be located under the left side fairing. The other fitting on the canister is for the fuel tank vent hose. If your bike is no longer equipped with a canister (someone removed it), you can simply connect a length of hose to that fitting on the carburetor and route it down under the bike, alongside the hose that comes off the bottom of the carburetor, which is the float bowl drain hose.

[superjocko]

Looks like a vacuum line for you EGR valve. Not necessary, at least won't keep it from running. But if the vacuum source that plugs into is not plugged, it could make it hard to start.

It's a pulsed air injection valve, not an EGR (exhaust gas recirculation) valve.

[CheapThrills]

It's a pulsed air injection valve, not an EGR (exhaust gas recirculation) valve.


Never understood why the low temp hoses and everyone calls them EGR valves too.


3 lines I found on my bike, 1 sensing line(being held), a line to draw filtered air from airbox, and last line to feed air on exhaust to allow cat to work fully.



Some people cap and remove lines, since cats usually go wayside, but know this maybe this will help you figure what to do.


Tell us what you decide and love sharing of photos.

[flopsweat]

For photo reference, these two with the red arrow are connected. I couldn't trace out where the one from the carb side port goes to for a pic, at this time. This is from a 2021 TT250.



https://i.ibb.co/MDq7LV9/20241001-071047.jpg (https://ibb.co/MDq7LV9)




https://i.ibb.co/2Mz8smC/20241001-071055.jpg (https://ibb.co/2Mz8smC)






https://i.ibb.co/jwSCPc0/20241001-071105.jpg (https://ibb.co/jwSCPc0)

[ughmas]

For photo reference, these two with the red arrow are connected. I couldn't trace out where the one from the carb side port goes to for a pic, at this time. This is from a 2021 TT250.



https://i.ibb.co/MDq7LV9/20241001-071047.jpg (https://ibb.co/MDq7LV9)




https://i.ibb.co/2Mz8smC/20241001-071055.jpg (https://ibb.co/2Mz8smC)






https://i.ibb.co/jwSCPc0/20241001-071105.jpg (https://ibb.co/jwSCPc0)


Hose in first pic goes to the intake boot (coupling between carb and motor), second one goes to the charcoal canister.


reference: forgive the horrible pics/paint writing, but I took these when I removed my emissions years ago

[flopsweat]

The hose in your first photo is supposed to attach to a fitting on the intake manifold. The intake manifold is the black rubber piece between the cylinder head and the carburetor.

The fitting on the side of the carburetor is the float bowl vent. If the bike is equipped with an evaporative emissions canister, it connects to one of the fittings on the canister. The canister is a round black piece about the size of a regular can of soup and would be located under the left side fairing. The other fitting on the canister is for the fuel tank vent hose. If your bike is no longer equipped with a canister (someone removed it), you can simply connect a length of hose to that fitting on the carburetor and route it down under the bike, alongside the hose that comes off the bottom of the carburetor, which is the float bowl drain hose.


I was wondering about removing the emissions canister, it's just kind of annoying and looks dumb. Is there any re-jetting involved with that? So if I take it off and route the "side" port of the carb hose down to the bottom, would I just remove the other canister hose that goes to the tank?

[ughmas]

I was wondering about removing the emissions canister, it's just kind of annoying and looks dumb. Is there any re-jetting involved with that? So if I take it off and route the "side" port of the carb hose down to the bottom, would I just remove the other canister hose that goes to the tank?


yes removing emissions is easy, remove canister and hoses. cap off side port on carb with vaccum cap, same with the port on the tank (or put a breather vent on it, pressure can build up with it completely capped off but has not been an issue for me)

[superjocko]

I was wondering about removing the emissions canister, it's just kind of annoying and looks dumb. Is there any re-jetting involved with that? So if I take it off and route the "side" port of the carb hose down to the bottom, would I just remove the other canister hose that goes to the tank?

You can install a longer vent hose on the tank fitting and just run down under the bike alongside the other hoses from the carburetor. If you were to cap the fitting on the tank, you'd have to use a vented gas cap.

[flopsweat]

Does anyone happen know what size fuel line it would be on the underside of the gas tank?

[Do©Hawk]

Does anyone happen know what size fuel line it would be on the underside of the gas tank?

My Hawk DLX fuel filter fits 5/16"(8mm) fuel line. I dunno if it is the same as the tt250. I have EFI and high pressure fittings, but the fuel line itself is probably the same size. No guarantee, but something to start with.