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Pod filters require removal of the floatbowl vent tubes.

KEITH KRAUSE

KEITH KRAUSE

Forum Guru
Past Site Supporter
TGSR Superstar
Charter Member
I know this applies to VM roundslide carbs,I don't know if it applies to 'CV' carbs. I installed a Dynojet stage 3 kit 3 years ago and it runs great. The kit is intended to be used with pod's and 4-1 pipe. One requirement was to REMOVE THE FLOATBOWL VENT TUBES. (I'm talking about the 2 tubes, one is on the left upper side of carb #2 and one is on the left upper side of carb #4. I'm NOT talking about the 4 overflow lines under the bowls.) I assume other brands of kits say this also. I called and asked Dynojet why? They said if they are left on, a "vortex'' or something is created and the carbs won't vent right. I accepted the answer and the bike ran great so I left it alone.
Recently,(just out of curiosity) I decided to put the tubes back on just to see what would happen. In less than a mile the bike started showing fuel starvation and I'm sure it would have stalled. I removed them and it was fine again. End of that test! THE POINT OF THIS TOPIC IS: How many people did not buy a jet kit and just bought jets and started adjusting? With no instructions, how would they know the tubes must be removed? I can see all these guys going nuts, blaming the jets or their own knowledge, when the reason the bike won't run right is because of 2 #!*$ vent tubes! With pod's, no matter how perfect you jet your bike, it won't run right with these tubes on(if at all.) Hope this helps someone. KK.
 
Dynojet advises doing that on all their jet kits, even their Stage 1's. On most bikes, it's merely precautionary, as vent hoses can get plugged or kinked. Apparently, on your particular bike, it's mandatory. I generally remove them on any bike. The down side is, should the drain hose ever plug, you could vent fuel all over a hot motor. (not likely, but possible).
 
Really? Hmmph, I left mine on and it seems to run fine, then again maybe thats the cause of my low speed stutter :?
 
My tubes got lost before I put on pods...so I never got to learn this!!
 
interesting...mine runs fine with them on. one fell off and its somewhere in my friends trunk when i was moving bikes, so i left it off. i have no issues with it on my 550.
 
Jon Kramilius said:
Really? Hmmph, I left mine on and it seems to run fine, then again maybe thats the cause of my low speed stutter :?
Click to expand...
Remember,I said "VM' carbs and possibly 'CV' carbs. On my bike, it was EXACTLY like running out of gas, except I pulled over to remove them before it could stall. I'm 99% certain it was gonna stall. It was that bad. On your bike (CV's right?), maybe it is not as bad or nothing at all.
 
AOD said:
interesting...mine runs fine with them on. one fell off and its somewhere in my friends trunk when i was moving bikes, so i left it off. i have no issues with it on my 550.
Click to expand...
If you have only one on, it may not be as bad, but I would think it would still be bad enough. I'm not sure why your bike reacts differently than mine. In past posts you did say your bike is running very rich. This could act as a compensating factor for 2 of your carbs not venting properly(the 2 that still have a vent tube.)Poor venting is actually a lean condition. The fuel can not be easily drawn into the carb throat. But if you're running over rich, in a carb that is not venting properly, the 2 problems may 'cancel' each other. This would allow the bike to run, but not as well as it could. The mixture entering the combustion chamber would still not be atomized correctly,due to the smaller volume of air entering the bowl and eventually the jets,so the end result would still be too rich, like yours.
 
i have 3 of the 4 vents on the bike. i will remove them and see how it runs. it ran overly rich in the past because i opened the pilot screw a bit, and it just ran rich because i dont know what the previous owners did.

now that i have the carbs on a differnt bike, and i closed the pilots 1/4 turn it seems to be running great. the extra spark from the Dyna is helping no doubt.

i plan to pull the plugs this weekend and check how they look after its first week of driving. (about 60 miles)

~Adam
 
Keith,

Could you please clarify.....

Do you mean the two vent tubes up top, or are you talking about the four float bowl overflow tubes, coming from the float bowls?
 
Jon. Mine were easy to put on or pull off. If yours are easy too, why don't you try pulling them off and test it? I'm interested to see what other bikes are effected. Maybe your 'CV' carbs won't react. But maybe it will clear up the problem you mentioned?
 
AOD said:
i have 3 of the 4 vents on the bike. i will remove them and see how it runs. it ran overly rich in the past because i opened the pilot screw a bit, and it just ran rich because i dont know what the previous owners did.

now that i have the carbs on a differnt bike, and i closed the pilots 1/4 turn it seems to be running great. the extra spark from the Dyna is helping no doubt.

i plan to pull the plugs this weekend and check how they look after its first week of driving. (about 60 miles)

~Adam
Click to expand...
Adam. I don't know what you mean by "I have 3 of the 4 vents on the bike". If your carbs are like mine, as you said they were earlier,there are only 2. One is on the left side of carb #2 and the other is on the left side of carb #4.
 
frosty5011 said:
Keith,

Could you please clarify.....

Do you mean the two vent tubes up top, or are you talking about the four float bowl overflow tubes, coming from the float bowls?
Click to expand...
I'm talking about the 2 floatbowl vent tubes,that is their correct name. They allow air into the floatbowl chamber. Air must enter the bowls for fuel to be drawn up easily. If you take a bottle of water and turn it upside down, the water will not come out smoothly, it will come out under vacuum. If you put a hole in it to vent it, the water will come out much smoother and faster. It's the same idea with the vent tubes. Each of the 2 tubes vents 2 carbs. The 4 small lines under the carbs floatbowls are overflow lines. They are meant to safely drain excess fuel from the carb due to too high of a fuel level in the bowl.
I really don't know yet why installing pod's (at least on VM carbs)changes the way the venting works. I THINK because the pod's draw so much more air, the length of the vent tubes creates too much restriction for good air flow. A 'vortex' is created. The vents WITH the tubes cannot keep up with the new higher demand on them. So you get fuel starvation. So if you remove them, the air is still entering through the same size fitting,but you still have removed some of the restriction. Apparently, Dynojet agrees.It is possible that the 'CV' carbs breath better than the older 'VM's so they may not be effected as much or even at all. Their design is so much different.
Frosty. I thought I was being clear about the vent tubes. If some people mistake the vents for the overflow lines, it would make me sound nuts! 8O
 
But, but Keith, we are all quite certain you're nuts. Now, we are simply trying to determine to what degree. :-)

Earl


KEITH KRAUSE said:
Frosty. I thought I was being clear about the vent tubes. If some people mistake the vents for the overflow lines, it would make me sound nuts! 8O
Click to expand...
 
When you removed the vent tubes, did you cap off the vent nipples on the carbs? :?
 
When you removed the vent tubes, did you cap off the vent nipples on the carbs? :?
 
earlfor said:
But, but Keith, we are all quite certain you're nuts. Now, we are simply trying to determine to what degree. :-)

Earl


KEITH KRAUSE said:
Frosty. I thought I was being clear about the vent tubes. If some people mistake the vents for the overflow lines, it would make me sound nuts! 8O
Click to expand...
Click to expand...
Well, lets put it this way. If someone ever tried to measure my 'condition' with a vacuum gauge, they would spill some mercury.
 
chockypudding said:
When you removed the vent tubes, did you cap off the vent nipples on the carbs? :?
Click to expand...
NO!!! The fuel will not flow if you cap the nipples. I meant to mention that earlier but did'nt. The whole idea of removing the tubes if you have pod's is to minimize the restriction. Capping the vents would be total restriction.
 
Frosty. I thought I was being clear about the vent tubes. If some people mistake the vents for the overflow lines, it would make me sound nuts!
Click to expand...

LOL, Keith - When I read Adam's reply, about blocking all 4 tubes, I did a double-take, and figured that was where the problem was. But I can see where one can get the wrong impression about which hose is meant. I don't know the "formal" names for the hoses, I just call the two on top the "vent" hoses, and the 4 on bottom the "float bowl overflow" hoses. Then you come along and start using proper terms like "float bowl vent tubes".....hell, now we all confused, LOL.
 
frosty5011 said:
Frosty. I thought I was being clear about the vent tubes. If some people mistake the vents for the overflow lines, it would make me sound nuts!
Click to expand...

LOL, Keith - When I read Adam's reply, about blocking all 4 tubes, I did a double-take, and figured that was where the problem was. But I can see where one can get the wrong impression about which hose is meant. I don't know the "formal" names for the hoses, I just call the two on top the "vent" hoses, and the 4 on bottom the "float bowl overflow" hoses. Then you come along and start using proper terms like "float bowl vent tubes".....hell, now we all confused, LOL.
Click to expand...
Now you got me confused. Where did Adam say he blocked all 4 tubes? All I read was he ''has 3 of the 4 vents on the bike''. To which I replied "I don't know what you mean"? Seriously, I try to be clear, and it's a shame if info is missread. This could effect so many bikes and the cure is so simple. Later on I'll try to come up with another topic to cause trouble. :wink:
 
LOL :lol:

this has to be the most off track thread ever. okay Keith, i was talking about the bowl overflow tubes. YOU were talking about the two hoses on the carb bodies, right? they dont connect to anything...the one by #4 just dangles somewhere for me, and i'm not sure about another one. one vaccume line runs to my petcock.

~Adam
 
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