Carbs

[mikey]

Can anyone identify these carbs, they are off a 1980 KZ1000
not sure of the real history of the bike as it was built as a chop several years ago

[kev edwards]

Mikey they look like 34mm cv type , U.S market with accelerator pump , i believe at low speeds they run on a weak mixture and the pump richens it as the throttle is opened.

[uk kev]

standard 28mm carbs with accelerator pump, as fitted to many 1000cc zeds

[kev edwards]

oops yes 28s i thought they were the ones on his other thread , should have looked closer.

[mikey]

Cheers guys in the second pic does it look like there is a cover
missing off the acceletator pump, if so would this effect the running
of the bike, also the mixture screws have been turned all the way in
im guessing that is not right and they should be 1 to 1 and quater turns out?

[uk kev]

Mikey, no cover missing, that is how they look I think, 1-1/4 turns from lightly seated, + or - 1/4 turn.

[uk kev]

Here is a set on e-bay



I have an accelerator pump rebuild kit coming, that included in my carb kits, I won't need it so it is yours if you want it..

[Alexander]

Cheers guys in the second pic does it look like there is a cover
missing off the acceletator pump, if so would this effect the running
of the bike, also the mixture screws have been turned all the way in
im guessing that is not right and they should be 1 to 1 and quater turns out?

Hi Mikey,
my mate had a set of these on his 1000- I believe were mainly used on US bikes due to emission controls enabling bike to run lean but with a handfull of throttle the pump squirted a bit gas in to prevent lag.
These carbs realy should to be used with vacume fuel tap with priming facility.
I also remember his looking like yours as if a component was missing on the bottom so maybe this is normal, but one of the online parts finders should be able to identify this for you.
The air screws being set fully in may be an indication there was an air leak in the system when they were last used. I tend to check this at tune up time by turning them fully in the respective cylinder should cut out, I found that all four carb rubbers were leaking as engine ticked over better when they were all screwed in, and after wasting time trying to seal them with RTV etc finally sorted the problem with new rubbers.

[jimmock]

Alex,

That was a l o n g sentence, I almost needed a bigger monitor to get it in !!!


Jimmock.

[mikey]

Cheers guys in the second pic does it look like there is a cover
missing off the acceletator pump, if so would this effect the running
of the bike, also the mixture screws have been turned all the way in
im guessing that is not right and they should be 1 to 1 and quater turns out?

Hi Mikey,
my mate had a set of these on his 1000- I believe were mainly used on US bikes due to emission controls enabling bike to run lean but with a handfull of throttle the pump squirted a bit gas in to prevent lag.
These carbs realy should to be used with vacume fuel tap with priming facility.
I also remember his looking like yours as if a component was missing on the bottom so maybe this is normal, but one of the online parts finders should be able to identify this for you.
The air screws being set fully in may be an indication there was an air leak in the system when they were last used. I tend to check this at tune up time by turning them fully in the respective cylinder should cut out, I found that all four carb rubbers were leaking as engine ticked over better when they were all screwed in, and after wasting time trying to seal them with RTV etc finally sorted the problem with new rubbers.

And so i guess as he is running K&N filters this would negate the exhaust emission control and would he be better off with a set of Z1000 carbs without all those extra bits on?

[Alexander]

Alex,

That was a l o n g sentence, I almost needed a bigger monitor to get it in !!!


Jimmock.

Get a W i d e screen moni jim, that 10inch box you got aint no good. lol.

[Alexander]

Mikey,
the filters should only effect crankcase gas recycling system and if the carbs are not the type that had connections to cam cover breathers then all should still work fine connected up as normal making sure all vacum pipe take offs are conected correctly. And even if they had additional take offs for cam cover breathers they could be simply blanked off.
If you are unsure about which is which then I am sure some members here could help identifying them for you.
I have heard that good working pumper carbs are very good, especially with modified engines, I assume the extra squirt of gas from the pump helps compensate flat spots when the throttle is yanked open under load.
Certainly my mates ran very well with them and was running standard air box (K&N filter) with 1170 wiseco.
I have not had much personal experience with the pumpers so perhaps someone else can jump in. How ever I do have a set of good Z1R carbs you could borrow but postage would mean cost, if you felt happier with them we could sort something out later, maybe a swoppsie for your pumpers, I only keep them as spares for my Z1 which they are set up for at present.

[mikey]

Thanks alexander,

very helpful let you know how it goes as this is not for me
but a mate of mine whose having carb probs