just received the assembled megajolt from the u.s. AND the R1 carbs i got from ebay in the same week!

whats more the carbs came spotless with the airbox trumpets AND the manifold rubbers (i was really not expecting them)

heres a pic

R1 bike carbs

now i need some help identifying its parts. i gather some in this pic are correct? what is the piece with the ?? i think its the t-piece everyone talks about but i dunno what it does.




identifying parts



also, what is this sneaky little tube for? theres a smaller one at the other side.


Description




finally, how does this open and close?

Description

sorry for the ignorance.. i'm quite unfamiliar with these carbs.. not much info on the net i suppose...

any help appreciated

Thanks
Tom

[Edited on 2/10/07 by robertst]

Hi there,

Lets just clear up a few things.

1:
What you have labelled 'Choke' is the fuel cut-off, this slide needs to be held open with a small spring or cable tie in order to run.

2:
What you have labelled 'Fuel inlet' is an oil vapour seperator, normally goes to the crank case, and when under inlet vacuum draws the oil vapour into the inlets and burnt off.

3:
What you have labelled '???' is the fuel bowl vents, these simply allow excess fuel vapour to 'vent', normall fed back to the air box, or just to atmosphere with little foam filters to stop bits going down..

4:
What you have labelled 'Mixture Screw' is the idle speed screw, you will see that it moves the throttle stop. The idle mixture screw, is normally just behind and below the throttle plates,.

5:
the black plastic slides inside the carbs, are the variable chokes, they will move up as the revs increase and the manifold pressure changes. They ensure that air speed is fairly constant through the carbs at all throttle openings, this means better fuel economy and good low rpm torque..

Have you got a photo of the throttle plate side, ?

[Edited on 2-10-07 by takumi]

cheers for clarifying it up for me... had no idea... about the fuel cut-off cable, if i pull it does it let fuel in or does it cut it off?
and the crankcase thingy can i just leave it as is? no need to connect it to anything?

so i guess the fuel inlet is the sneaky little tube in the third pic?

is this the pic you needed?

other side

[Edited on 2/10/07 by robertst]

[Edited on 2/10/07 by robertst]

i agree with above apart from you did correctly lable the choke and it does not need to be held with a spring (i am running r1 carbs)

The fuel inlet is on the bottom copper pipe ignore the silver heating pipes not needed

1:
What you have labelled 'Choke' is the fuel cut-off, this slide needs to be held open with a small spring or cable tie in order to run.


Bollocks it's the choke!

quote:

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Originally posted by Pdlewis
i agree with above apart from you did correctly lable the choke and it does not need to be held with a spring (i am running r1 carbs)

The fuel inlet is on the bottom copper pipe ignore the silver heating pipes not needed

---

Description

Naughty me,

I've just looked back over my mikuni service manual,

and yes..

That is the Starter Cable..it actuates the Starter Plungers..

[Edited on 2-10-07 by takumi]

Yes that pipe is the heater circuite and not used

Takumi - The idea of a choke (although i dont need it) is it needs to be open to start the engine. if you are holding this open it will be running way to rich!!!

might be why it failed the emissions

bummer..

Can confirm its choke.

I never needed mine even from a cold start having stood for a week.

If i was starting it when not in the car then i would manually rev the engine a little when cranking and when in the car a couple of blips on the throttle were enough to make it start when cranking.

quote:

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Originally posted by takumi

I've just looked back over my mikuni service manual,

[Edited on 2-10-07 by takumi]

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p2p

What is labled "fuel intake" in the pic is actually a breather. The fuel inlet is underneath, to the right hand side of the photo.

The sliders pointed to by the arrow slide all by them selves.

oh so its this one then???
Rescued attachment thisone.jpg

on your intial post there is a pipe next to a blue tissue thats the fuel inlet

quote:

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Originally posted by andyharding
1:
What you have labelled 'Choke' is the fuel cut-off, this slide needs to be held open with a small spring or cable tie in order to run.


Bollocks it's the choke!

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Thats what I thought..

That small pipe arrowed, looks like it could be a vacuum take-off..

Choke aint a bad sorry.