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post #1 of 10 (permalink) Old 3-21-2013, 5:31 AM Thread Starter
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cvk 40 need help

I have a 1999 zx9r with 24000 miles on it with 4 CVK 40 on top. I have changed float o-rings and needles, set float height and cleaned them the best I know how. The bike will start and idle like new. When I blip the throttle it responds awesome. IF I thy to hold a higher RPM ( say 5000 or so ) I can see fule running down the inside of the carb coming out of the needle jet. It looks like I get this even before I get lift from the slides. I am thinking this is bad. I would expect more of a mist or spray. Any thoughts would be great.
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post #2 of 10 (permalink) Old 3-21-2013, 8:50 AM
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Re: cvk 40 need help

adjustable carb kit needles?

happening on 1 carb or all 4?

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post #3 of 10 (permalink) Old 3-21-2013, 5:14 PM Thread Starter
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Re: cvk 40 need help

The carbs are as stock as the day I bought the bike. No adjustment on the needles and the stock jets are still in there. All four carbs are doing the exact same thing. I have just went over the entire bike because I did not see this happening at first. Things I have done. Plugs, Checked cam sensor, throttle sensor, pickup coil, and even did a valve adjustment because they were very tight. I am waiting on a better float hight tool and compression gauge. I am going to check float height and fuel level again but it looks like the fuel is not atomizing. I gut some spray but the fuel running down the carb has to be bad. There is also fuel getting on the slides themselves I am guessing because the bike is flooding
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post #4 of 10 (permalink) Old 3-21-2013, 6:22 PM
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Re: cvk 40 need help

These are downdraft carbs. And I take it you are viewing this running condition with no airbox cover.
Do you normally run with an airbox or pods?

You sound competent. You changed needles ...were the replacements absolutely the same? During reassembly the needles were inserted into the slides first...BEFORE the retainers?

Did the bike sit dormant or in storage long? I'm sure you have checked the emulsion tube's holes for blockages and cleaned the needle tip to seat sealing surfaces. But getting the float height right is critical to loading (or not). That needs to be addressed and eliminated.

Is the choke operational?

How are the spark plugs burning?



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post #5 of 10 (permalink) Old 3-22-2013, 5:09 AM Thread Starter
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Re: cvk 40 need help

Yes viewing with air box off. I run 100% stock with air box. Did not change the needles and they did go in the slides before the retainers. Bike sits for the really cold months. I did clean the emulsion tubes and jets. I do need to check the needle tip to seat sealing surface. It looked very clean but it is brass and the color may have hidden the dirt. I am waiting on a float height tool but I used a hoes and the mark on the side of the carb and it seems dam close, 4.5mm below. Choke works fine bike starts right up every time. When I pul the plugs after running the tip looks god but there is some fuel on the threads. This happen while I was riding and seemed to come on all at once. Thanks for your time.
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post #6 of 10 (permalink) Old 3-22-2013, 8:01 AM
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Re: cvk 40 need help

i'd venture to say with the addition of the airbox all will become right in the world again. The CV carbs rely on air velocity, pressures, science, blah blah blah, which the factory engineers have designed in that airbox,

As you report idles, responds to throttle fine.

Would still get the float levels precise. At that point, get the airbox on, ride and and evaluate throttle response, performance etc.

Also closely monitor fuel consumption over a few tankfuls.

Thats about all I can offer. Good luck with it.

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post #7 of 10 (permalink) Old 3-22-2013, 7:24 PM Thread Starter
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Re: cvk 40 need help

O.K. I will give it a shot. I did a compression check today while it was warm. Did not even get 150 out of it. Manual says 155 to 265 is livable. The gauge sender would not fit correct I had to use 3 o-rings on it so I don't believe the reading. I am going to check everything one more time. Even down to the valve shims again. Whats a few more nuts and bolts.
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post #8 of 10 (permalink) Old 3-22-2013, 8:18 PM
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Re: cvk 40 need help

If you are seeing no abnormal starting/ running issues, and everything appears to be running as it should... I'm going to side with Ducati on this. Low compression certainly wouldn't cause that type of fuel delivery issues, but I'm sure you know that. If you still have concern, the only way you could possibly know is to set a digial camera or something of that nature in the airbox, turned to video mode, with a light of some type. Run the bike, shut off, disasemble, and view video.. if you need that peace of mind.

Again, as long as all parameters seem to be there, and the bike runs "okay" or as normal... I think Duc is right on the money here.
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post #9 of 10 (permalink) Old 3-28-2013, 1:34 PM
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Re: cvk 40 need help

Quote:
Originally Posted by two_seater_twister
I think Duc is right on the money here.
+2

Bikes: 2003 Bandit1200, 1974 RV125, 1972 TS250 Racer<br />Previous: 1992 EX500, 1998 EX250, 1988zx600c, 1990 XT350, 1988 RM250
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post #10 of 10 (permalink) Old 4-21-2013, 9:52 PM
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Re: cvk 40 need help

Check out the two looped videos on this page. Look familiar? http://www.factorypro.com/products/F...u_hi_disp.html

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