Hi, could somebody please tell me what the various pipes are on these carbs.

Also if anybody has a manual for a bike with these carbs I would be really gratefull as all the manuals I've found are for the later models with TB's.

TIA

Rich

look the same as my blackbird ones

3 is the fuel pipe (from pump / tank)
2 is the breather or the top of the vacuum chamber
1 is the breather for the float chamber

On the bike I think 1+2 would have been connected to the airbox. I have just put some longish bits of pipe on 1+2 on my carbs and had no problems

[Edited on 27/1/08 by givemethebighammer]

they look similar to my cbr600 fx carbs:

1+2, i think are heater pipes
3, fuel in

1+2 put in to the airbox.

I agree with everything the bighammer man said, except (1).

That is a connection to the top of the float chamber, but it was originally intended to allow the use of a catalytic converter with carbs. When the ignition was on, the top of the float chamber was at atmospheric pressure, which meant that the fuel could get sucked up through the jets into the airflow. If the ignition stopped working while the engine was running unburnt fuel could have got into the cat, ruining it, so a solenoid valve operated when the ignition was turned off, which put the vacuum from the venturi into the top of the float chamber. This meant that the float chamber pressure was the same as the in the venturi, so no fuel could be sucked up.

So - in our application - it should be left open to atmosphere to let the carbs work normally. You might wish to put some sort of filter over the tube inlet to stop muck getting in, but it's not essential.

You may also find a Y-shaped inlet between each outside pair of carbs - this was connected to the bike's coolant system to give a form of de-icing. This can also be left disconnected without any problems.

HTH,
David

Thanks guys !