Craigorypeck
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| posted on 5/1/11 at 02:12 PM |
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First start! bike carbs
So I got the new engine fired up, YB cossy on ZX9Rs..
My AFR says I'm running lean at idle and adjusting the pilot screws underneath seems to do nothing?
And when I give it a lot of revving the sliders dont move? just stay well and truely at the bottom..
Any tips peeps?
Whats the proper procedure for cold starting bike carbs?
Cant take it for a drive yet as I have no steering....
No RRs in Ireland will touch bike carbs on a car engine so all pointers possible please
I have checked the flow with a meter and all are bang on with each other.
[Edited on 5/1/11 by Craigorypeck]
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jacko
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| posted on 5/1/11 at 04:40 PM |
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Hi what model zx9r carbs do you have ?
Have you balanced the carbs ?
the screws under the carbs are used for fuel at tick over then the main needles/ jets take over as the revs come up
Have you striped and cleaned the carbs?
are the slides smooth to lift with your finger ?
is it all the slides that don't move or just 1 or 2
has the manifold got a good seal to the head no air leaks any were
Jacko
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Craigorypeck
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| posted on 5/1/11 at 08:25 PM |
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Hey.
I have C1 models.
Carbs balanced with a synchronizer, didn't need much, all were pretty bang on equal.
There was a small blow from the exhaust near the afr sensor,must have been letting air in maybe. Patched that up and it now works better and the screw
adjustments have an affect on the reading.
Carbs were completely stripped and meticulously cleaned in thinners.
The slides lift and have a slight resistance going up and down from the air above and below the diaphragm, when rebuilding- one didn't have any
resistance and snapped shut very fast. This was because the diaphragm wasn't seated correctly under the cover. All are equal now.
Started upain a while ago and one slide moved ever so slightly but I was near 5000rpm before it moved.... Don't really wanny be up round there
too much on a fresh build!
Manifold face is true and has a cometic gasket on it. Fluro lined silicone hose is jubilee clipped up nice and tight. Defo no air leaks.
At what rpm should they start moving??
[Edited on 5/1/11 by Craigorypeck]
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tul214
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| posted on 5/1/11 at 08:45 PM |
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Not the best film but shows that the sliders should move from quite low revs;
here
1.6 Raw Super6 sold
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deltron63
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| posted on 5/1/11 at 09:03 PM |
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Here's mine
http://www.youtube.com/watch?v=Apqs5EqZuOo
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Craigorypeck
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| posted on 5/1/11 at 09:08 PM |
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quote:
Originally posted by deltron63
Here's mine
http://www.youtube.com/watch?v=Apqs5EqZuOo
I'm easily hitting those revs and they dont move?
What size choke have you on there?
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deltron63
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| posted on 5/1/11 at 09:32 PM |
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Mine are ZX6R with 165 main jets on a 1.8 zetec.
Are you using a bike fuel pump? it makes all the difference
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Craigorypeck
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| posted on 5/1/11 at 09:47 PM |
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quote:
Originally posted by deltron63
Mine are ZX6R with 165 main jets on a 1.8 zetec.
Are you using a bike fuel pump? it makes all the difference
I got 180 mains, air correctors blocked up. Fed with a red top pump and filter king regulator sitting at 2.5 - 3 psi
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coozer
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| posted on 5/1/11 at 09:49 PM |
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Did you really use thinners to clean them? (cringe)
I used thinners on my first set and they ended up in the bin! It eated away at the ali and stripped all the rubber bits off.
The sliders not lifting is probably down to the flange at the top not sealing properly, however this rarely affects all 4. The thinners hasn't
destroyed any of the seals has it??
1972 V8 Jago
1980 Z750
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Craigorypeck
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| posted on 5/1/11 at 10:02 PM |
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All rubber seals, washers and diaphragms were removed.
Only the bodies were wiped with thinners and the brass bits steeped.
The diaphragms are all seated properly around the circumference....
Do you think a previous owner may have had stronger springs put in for some reason??
[Edited on 5/1/11 by Craigorypeck]
[Edited on 5/1/11 by Craigorypeck]
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uel90
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| posted on 6/1/11 at 06:09 AM |
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re:rolling road in NI
Am in the process of ordering bike carb set up for my cvh from bogg bros,when i mentioned final tuning after set up,they recommended holeshot racing
in co.down,after contacting them they have already fine tuned a few other bike carb set ups,and would be worth a call,
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Danozeman
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| posted on 6/1/11 at 07:25 AM |
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As coozer said, if the slides arnt lifting them its probably the diaphragms not sealed properly in the top. Remove them and put a smear of rubber
grease around the sealing edge then try it. I had loads of trouble with mine.
Have you blocked off the vent pipes aswell or are they open?
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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Craigorypeck
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| posted on 6/1/11 at 08:27 AM |
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quote:
Originally posted by uel90
Am in the process of ordering bike carb set up for my cvh from bogg bros,when i mentioned final tuning after set up,they recommended holeshot racing
in co.down,after contacting them they have already fine tuned a few other bike carb set ups,and would be worth a call,
Cool I haven't heard of them but will do a search and give them a ring!!
I'd like to have it run in before going to the tuners so I can have it set up properly to the redline.
Where abouts are you at yourself???
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Craigorypeck
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| posted on 6/1/11 at 08:37 AM |
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quote:
Originally posted by Danozeman
As coozer said, if the slides arnt lifting them its probably the diaphragms not sealed properly in the top. Remove them and put a smear of rubber
grease around the sealing edge then try it. I had loads of trouble with mine.
Have you blocked off the vent pipes aswell or are they open?
I'm 99% sure they are seated properly, spent ages getting the ribbed edge of the diaphragm into the track around the cover.
I'll defo take another look tho.
The float bowl vent pipes have a small filter on them, well away from any vacuums or pressures.
Are my carbs too big resulting in slower air speed not creating enough vacuum to raise the sliders???
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sonic
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| posted on 6/1/11 at 09:34 AM |
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You could try giving Bogg bros a ring they are helpfull guys UK no 01944 738234
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woolly
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| posted on 6/1/11 at 09:59 AM |
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on my zx6r carbs is a small O ring next to the diaphragms easy to forget and loose with the tops off.
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Craigorypeck
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| posted on 6/1/11 at 10:14 AM |
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I had a chat with them ages ago... They suggested the ZX9R carbs and the 180 mains I have in with the air correctors blocked up.
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Craigorypeck
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| posted on 6/1/11 at 10:15 AM |
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quote:
Originally posted by woolly
on my zx6r carbs is a small O ring next to the diaphragms easy to forget and loose with the tops off.
I'll give it a look. Thanks!
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ashg
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| posted on 6/1/11 at 10:29 AM |
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did you make sure you didnt loose the little o rings the screw driver is pointing at. they make the seal that lifts the diaphragms
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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Craigorypeck
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| posted on 6/1/11 at 11:14 AM |
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Mine have the ring as part of the diaphragm.
You can see it in the pic, just about
This is how I've put the needle in.
Diaphragm - washer below clip - clip - washer above clip - spring seat
Is that correct?
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woolly
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| posted on 6/1/11 at 11:16 AM |
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ashg you said it so much better than me
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Craigorypeck
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| posted on 6/1/11 at 11:24 AM |
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So I am missing those little devils???
edit
Nope.. the rubber washer is not needed as the rubber bit that sticks out of the diaphragm fits the profile of the carb perfectly.. No room for that
rubber washer
Care to comment on the arrangement of the needle assembly?
[Edited on 6/1/11 by Craigorypeck]
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lotusmadandy
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| posted on 6/1/11 at 11:38 AM |
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My zx9's have the the seal moulded into the diaghram and dont have the
small o rings.
I had problems getting mine to seal and lift when i touched the throttle
but perseverence and a touch of sealant got it sorted.
Oh,by the way,it might rev with no vacum to lift the slides but it won't drive at all.
I know this because i tried it.
Andy
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Craigorypeck
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| posted on 6/1/11 at 11:49 AM |
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quote:
Originally posted by lotusmadandy
My zx9's have the the seal moulded into the diaghram and dont have the
small o rings.
I had problems getting mine to seal and lift when i touched the throttle
but perseverence and a touch of sealant got it sorted.
Oh,by the way,it might rev with no vacum to lift the slides but it won't drive at all.
I know this because i tried it.
Andy
Thanks for that..
Haven't got as far as driving it yet. I would if I had steering.
Is there any way of checking the seal?
What about a small tube connected to the air hole on the slider, suck on it and see if it lifts and stays up? (ahem)
This is all new to me sorry folks, DCOEs any day but been there done that!
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lotusmadandy
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| posted on 6/1/11 at 12:07 PM |
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To check the seal all you need do is push the slides up to the top
and let them fall back down.
You should feel resistance on the way up and hear the air being forced out,
then they should fall slowly back to the start position.
They should all be exactly the same.
The fact that they dont move with the engine running,tells me that they
are not sealed.
Bike carbs are better than dcoe's in my experience.
(just my opinion though,you must understand )
Andy
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