to everyone with cv carbs trying to run pod filter

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06 Sep 2011 08:00 #474567 by kzbigrick
Ok age old question. Why can't I get my bike with cb carbs to run right with pos filters? Ok here is the answer and the solution to your problem. I have a kz 900 with some late model cv carbs on it (don't ask got it that way) with pod filters on it. Bike was running like shit when gave anymore than about 1/4 throttle. Started searching the net to only find the same answer "pods on cv carbs don't work". I don't like being told something won't work so I kept asking until I asked a guy that owns a local shop and this is the fix. If u look at carb there is a kinda kidney bean shaped port , well the pod filters block air flow thru this port. Cv carbs use air(suction) to raise slides. When twist throttle it opens butterfly which supplies air to motor and to carb to move slides via those ports. All u have to do is notch the rubber inside the pod that mates with port. U can pop the filter off the boot and put boot on carb so u can see where and how much to notch. I was lucky to get 2500-3000rpm out of my bike before I did this now it is running fine. U will still have to do some jetting as with any performance upgrade. I hope this post answers this age old question and saves a lot of headaches for people.

76 kz900
Gsxr front end
Honda vfr fender
Pro club arm
Gsxr rear wheel w/ 190/55/17
Katana rear brake
V&H side winder
Dyna ignition
Accel coils and wires

***Far from done ***
The following user(s) said Thank You: JaimeMs

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06 Sep 2011 10:10 #474600 by roy-b-boy-b
Replied by roy-b-boy-b on topic to everyone with cv carbs trying to run pod filter
I have been running 34's for years and don't have problems. Roy

1979 LTD Street Fighter.1977 KZ1000

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06 Sep 2011 11:55 #474613 by 531blackbanshee
Replied by 531blackbanshee on topic to everyone with cv carbs trying to run pod filter
it is nice when someone says/shows how they got something to work right.


just showing a picture or saying "i can make them work"isn't really helping anyone else.

thanks for posting this kzbigrick.

leon

skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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06 Sep 2011 13:40 #474632 by roy-b-boy-b
Replied by roy-b-boy-b on topic to everyone with cv carbs trying to run pod filter
The reason I don't say anything on how I get mine to work because there are members that are the experts and the only experts so I just keep the peace. Roy

1979 LTD Street Fighter.1977 KZ1000

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06 Sep 2011 13:54 - 06 Sep 2011 13:56 #474636 by 531blackbanshee
Replied by 531blackbanshee on topic to everyone with cv carbs trying to run pod filter
i understand roy.
i was not trying to jab anyone.
there seem to be alot of folks that either love or hate(understand or don't)cv's.

i can tell you tho that if i was to try to run some cv's,you would be hearing from me.
because of the way you have handled yourself in the past.
seems like no bs,just here is what works.
cut and dried ,just like i like it. :)

leon

skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0
Last edit: 06 Sep 2011 13:56 by 531blackbanshee.

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06 Sep 2011 14:37 #474649 by otakar
What size CV carbs do you have on the 900? Is it stock?

74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000

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06 Sep 2011 15:49 #474664 by otakar
If your carbs came from a Kz1000 or 1100 you will have some problems. The draw between your bike and the "J" series motors is quite a bit different if your engine is stock. What you want is a set from a GPz750 (not a KZ750) Those would also be Mikuni carbs but the slides are quite a bit different to accommodate the lower draw threw them. You don't want KZ750 carbs because they are Keihin and they are SHIT. If your bike has had head-work done on it than the KZ1000/1100 BS34s would be fine but just need to be set up right.

74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000

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06 Sep 2011 16:13 #474668 by 650ed

otakar wrote: You don't want KZ750 carbs because they are Keihin and they are SHIT.


:laugh: :laugh: :laugh: No argument here.

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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06 Sep 2011 16:33 - 06 Sep 2011 16:35 #474675 by Polar_Bus

kzbigrick wrote: Ok age old question. Why can't I get my bike with cb carbs to run right with pos filters? Ok here is the answer and the solution to your problem. I have a kz 900 with some late model cv carbs on it (don't ask got it that way) with pod filters on it. Bike was running like shit when gave anymore than about 1/4 throttle. Started searching the net to only find the same answer "pods on cv carbs don't work". I don't like being told something won't work so I kept asking until I asked a guy that owns a local shop and this is the fix. If u look at carb there is a kinda kidney bean shaped port , well the pod filters block air flow thru this port. Cv carbs use air(suction) to raise slides. When twist throttle it opens butterfly which supplies air to motor and to carb to move slides via those ports. All u have to do is notch the rubber inside the pod that mates with port. U can pop the filter off the boot and put boot on carb so u can see where and how much to notch. I was lucky to get 2500-3000rpm out of my bike before I did this now it is running fine. U will still have to do some jetting as with any performance upgrade. I hope this post answers this age old question and saves a lot of headaches for people.


Ive read this "fix" before. And while I do understand what the idea is, I don't believe this is the "end all" correction for why CV's simply run like garbage with pods. If this above mentioned fix was the true issue than why do the pod mfg's not advise to perform this check and or modifiy the design of the pods to ensure the carb CV vent passageway is unobstructed ? CV carbs were intoduced 21 years ago, and 21 years later most performance tuners are still scratching their heads at how to get pods and CV's to cooperate together....

Bikes:
'84 GPz1100
'06 HD Fatboy
Last edit: 06 Sep 2011 16:35 by Polar_Bus.

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06 Sep 2011 17:01 #474685 by kzbigrick
Well everybody can say what they will. I got this tip from a guy that specializesi n oldschools he has one of the badest kz's I've ever seen. This fixed my bike and I hope it helps a lot of guys out.

76 kz900
Gsxr front end
Honda vfr fender
Pro club arm
Gsxr rear wheel w/ 190/55/17
Katana rear brake
V&H side winder
Dyna ignition
Accel coils and wires

***Far from done ***

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