Mole
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| posted on 14/9/08 at 08:07 AM |
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Bike Carb plumbing
I wonder if any of the bike carb experts can help me out with this one. Bike carbs have been fitted for a while now and I've reached the stage
where by I want to start the engine. However the float bowls on the carbs won't fill so and I believe its because I've plumbed the carbs
up incorrectly (CBR 600).
These carbs have four feeds for fuel the two inner ones are plumbed together and I have the two outer ones feeding into a t piece connected to the
fuel pump. Is this wrong, and if so how should they be plumbed up.
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indykid
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| posted on 14/9/08 at 08:18 AM |
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sounds like you've done it wrong to me unless you've got a different set of cbr carbs to any i've seen before. fuel should enter
into the two plastic T pieces on the lower side of the bellmouth side of the carbs. i believe the inlets are 10mm dia.
it then flows to the left and right halves.
the only way i can think you've done it is if you've plumbed onto the drains on the bottom covers, in which case, it's totally wrong
as there will be a screw in the way and would negate the operation of the float.
do you have a picture?
tom
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indykid
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| posted on 14/9/08 at 08:21 AM |
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see this thread
the fuel inlet is the grey pipe at the bottom of the picture with the brown t piece in the middle of it. it runs up to 2 black plastic Ts in the carb
bodies.
tom
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Mole
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| posted on 14/9/08 at 08:24 AM |
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I don't have a photo yet but I'll take one later. I'm pretty convinced I have done it wrong but I haven't plumbed onto the
bottom of the carbs.
Thanks for the link, my carbs have four connectors on the "rail" where the one on the picture has two.
[Edited on 14/9/08 by Mole]
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David Jenkins
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| posted on 14/9/08 at 09:39 AM |
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Have a look on my website (www link below) and follow the menu to the bike carbs bit - one part details the components of CBR600 carbs and what they
do (and how I modified them!).
This presumes that your CBR600 carbs are the same as mine - there are a few variants.
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UncleFista
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| posted on 14/9/08 at 10:01 AM |
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I have a PDF (17Mb) that's a copy of the Honda workshop manual. It's the chapters concerning fuel system, including exploded diagrams of
CBR600 carbs.
Anyone who wants a copy, just ask 
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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Mole
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| posted on 14/9/08 at 01:31 PM |
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Here is a picture of how they are currently plumbed up. The fuel pump cuts off before the carbs fill. I've tried disconnecting the loop in the
middle and attaching the fuel supply to each side but this just pushes fuel out of the other end.
 
Rescued attachment bike carb plumbing.jpg
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Mole
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| posted on 14/9/08 at 01:59 PM |
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Okay, so they are not fuel inlet are they. Can anyone lend me a pointy hat with the letter D on the front?
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