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Need help with carburetor

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Liuuu
L Plate Warrior



Joined: 29 May 2020
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PostPosted: 19:50 - 29 May 2020    Post subject: Need help with carburetor Reply with quote

What is the purpose of these 3?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 20:25 - 29 May 2020    Post subject: Reply with quote

At a guess a vent, an overflow and a tip-over drain. Traditionally all routed to atmosphere or the road but on more modern stuff, probably re-circulated into a closed system to reduce emissions.

One of them might be a take-off for a pulse air device, again emissions.

No idea which is which or if that's even correct. What's it off?
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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jaffa90
World Chat Champion



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PostPosted: 21:34 - 29 May 2020    Post subject: Reply with quote

Could that be a water cooled carb? (never seen one).
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xX-Alex-Xx
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PostPosted: 21:40 - 29 May 2020    Post subject: Reply with quote

jaffa90 wrote:
Could that be a water cooled carb? (never seen one).


If it's for water, it'll be not cooling but warming to stop icing in bad weather.

Otherwise take-offs for vacuum hoses? I only do FI, fuck carbs sideways - too much hassle.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 21:41 - 29 May 2020    Post subject: Reply with quote

jaffa90 wrote:
Could that be a water cooled carb? (never seen one).


Usually water heating for anti-icing. Never seen one set up like that but its possible. It's usually a lot more Heath-Robinson, couple of plastic spigots with rubber hose between them running through a bank of carbs.

I'm guessing that carb's off an aircooled single of some sort though? So carb icing unlikely to be an issue.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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jaffa90
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PostPosted: 22:55 - 29 May 2020    Post subject: Reply with quote

Yes, both correct, crazy really because you need heated carbs / fuel mixture before starting as in electric heated carbs.
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stinkwheel
Bovine Proctologist



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PostPosted: 23:33 - 29 May 2020    Post subject: Reply with quote

jaffa90 wrote:
Yes, both correct, crazy really because you need heated carbs / fuel mixture before starting as in electric heated carbs.


Not so much, carb icing only usually happens when large volumes of cold, moist air are being drawn through the carb. Usually also requires it to have been drawing large volumes of vapourising fuel for a while too to cool down the internals. So the classic situation is as you wind off the throttle to pull off a motorway on a chilly, damp winters night. The vapourising fuel has chilled the point of the throttle needle to below zero, you wind off and the moisture condenses in the airbox then next time you open the throttle a big gulp of cold damp air leads to an ice crystal forming on the end of the throttle needle. Bike stutters and conks out.

It's not the fuel that freezes, its moisture in the air charge. Petrol has a flash point of -45C. You aren't going to get carb icing at startup.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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steve the grease
Crazy Courier



Joined: 26 Jan 2018
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PostPosted: 14:10 - 30 May 2020    Post subject: Reply with quote

The little pipe is a breather I guess. The two identical pipes go to a vertical chamber that is plugged at the top with a brass plug. Looks like it is water cooling, whether that is connected up for our mild UK climate is another thing. Carb icing can, rarely, be a problem in the UK, I have experienced it on one of my vehicles. Curiously enough there is a post about a Honda C110 on here. Some of these had the carb heated by the rocker oil feed from the engine, which went via the carb ( lots of copper washers required).
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stirlinggaz
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Joined: 22 Jul 2007
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PostPosted: 18:20 - 02 Jun 2020    Post subject: Reply with quote

jaffa90 wrote:
Could that be a water cooled carb? (never seen one.


No?
Comes as standard on a Yamaha TDR 125, I have a couple of Mikuni TM28 ss carbs which have the 2 pipes for water HEATING which just circulates the coolant/water from rad.
I won't upload the pic as it's huge, but I'm sure you can Google the Mikuni & you'll see it.
I had to join the 3 hoses together when I junked the carb for a Dellorto vhsa32 which doesn't have that function.

cheers,
GAZ
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