Query, just bought a used YBR 125, 2015

[Aland]

Can anyone identify this pipe that has a dot on it? Is it supposed to be connected?

[Tiggie]

Looks like a breather hose. Where is the other end attached?

 

 

[RideWithStyles]

Quite chunky that is missing its male counterpart part and wire clip, Looks like it could be to do with the air box, gonna guess like tiggie a breather/redirect waste air/pressure pipe, it should be connected to The engine too.
but in the background your missing another pipe as the clip/holder is there but no pipe.

 

looks like your bike has had a “Rodney” at it, or many times. Beware

Edited October 23, 2024 by RideWithStyles

[Aland]

Thanks I can't detect where the other end goes. Where can I get diagrams/ pictures/ videos etc if what I need to install?

[Simon Davey]

I reckon it's the fuel tank overflow/breather. 

[Tiggie]

I'd have a look for a Haynes manual for your bike.

 

https://www.ebay.co.uk/itm/394118640409?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=tegzt6pmqdi&sssrc=4429486&ssuid=oERdwDCnQ9i&var=662644107993&widget_ver=artemis&media=COPY

 

 

They can be invaluable for your bike, especially if you are doing the work yourself 

[Aland]

Thanks I can't detect where the other end goes. Where can I get diagrams/ pictures/ videos etc if what I need to install?

[Aland]

Thanks. So this pipe is as it should be, but clear of any debris. And the other that's apparently missing?

[Simon Davey]

24 minutes ago, Aland said:

Thanks. So this pipe is as it should be, but clear of any debris. And the other that's apparently missing?

 

Only way to really know, is to get yourself a manual, such as the one in the link that @Tiggie posted above. 

That would be £32 that could save you a lot of money and time. 

 

[Tiggie]

Have a look at this page. It has the service manual for your bike. Should be plenty of diagrams and pictures etc. 

 

https://www.manualslib.com/manual/1208156/Yamaha-Ybr-125.html

[Aland]

So the mysterious pipe with a dot on it, goes into this unit(foto) then another pipe goes onto the top of the air filter unit .

Edited October 24, 2024 by Aland

[Simon Davey]

So it's probably a drain for the throttle body ? 

 

Edited October 24, 2024 by Simon Davey

[Aland]

I believe the throttle body is further down?

[Aland]

Pipe with dot, above throttle body, which goes to top of air filter box, any ideas if it should be connected?

[Simon Davey]

It's either a breather/drain or vacuum. 

Looks like there's a hose clip on the air intake at the back of the throttle body, maybe it used to be longer and was put through that clip? 

[Tinkicker]

Part number 22.

 

 

Edited October 25, 2024 by Tinkicker

[Simon Davey]

That's brilliant @Tinkicker

So it eventually connects to the exhaust.

Blimey.

[Tinkicker]

When you to  get to the stage of locating long obsolete parts for long discontinued vintage bikes, you too will learn those skills..... 

Edited October 25, 2024 by Tinkicker

[RideWithStyles]

Thanks tinkicker.

Looks more like your missing part no20, 19,18, 17, 10 that connect to the exhaust for the extra air to be introduced to be burnt at the exhaust pipe.

 

 

Fuel tank overflows are very small pipes, and never had connectors mid point just one pipe straight down to the lowest point, has been on every bike I’ve ever owned.

Air ones for airboxes and engines are bigger just like in this case, generally dry but a hint of oil vapour or moisture is a give away but if it’s been like that for a while it probably is dry.

Another possibility but not for this bike if it had a clean air vapour canister, this cleans the air prior to pumping it out to the outside atmosphere and avoiding redirecting /recycling dirty contamination air within the tank/engine to the engine again as possible to not clogg it up.

Edited October 25, 2024 by RideWithStyles

[Mississippi Bullfrog]

A lot of engines around that time had valves that controlled emissions on cold engines - many riders disconnected them as they could prove troublesome. My guess is this is something along those lines. 

[Bianco2564]

It’s a secondary air induction system. Air is pulled into the exhaust to ignite any unburnt fuel.

[bud]

It's the PAIR system. If the exhaust has been changed. It probably won't fit anymore.