to everyone with cv carbs trying to run pod filter

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.

I have been running 34's for years and don't have problems. Roy

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

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

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

What size CV carbs do you have on the 900? Is it stock?

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.

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

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

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....

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.