Gas runs out of the carbs - Keihin CV - Page 2 - Kawasaki Forum ::
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post #16 of 17 Old 07-19-2013, 08:05 AM Thread Starter
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Starting a new post with my cooling problem
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post #17 of 17 Old 06-01-2017, 02:57 AM
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Originally Posted by MCIntruder View Post
Iīve checket the carburettor once Again and with a bit better outcome ;-)
I still canīt visually (eyes) see anything wrong with the seats BUT as I continued my examination of the needle pin and seats I found that especially two of them had a tendency to leak.
At first I placed the carbs with the bottom up and bowls dismantled. Connected my vaccum/pressure"gun" (handdriven) to the gasinlet on the carbs and at first I used waterbased gasleakliquid. When I only used air they all leaked at under 5 psi (at so low pressure I canīt measure the pressure excact).
The NeXT try was based on the former mentioned external “gastank” (a 1 L lemonadebottle) with a difference from gasolinelevel in the bottle and the bottom edge of the carburettorbody at about 45 cm. Now "only" two of them were leaking.
Dismantled the gastank. Off with all the needlepins. A motorcyclemechanic told me that they apparently used the excact method I mentioned before. A small millingmachine. I havenīt got something like that so I carefully took some cotton buds and a little toothpaste on the tips and turned them back and forth several times in each seat.
Reassembled the carbs, put the needles and floats in and used the later method again. No leaks.
With gas in the carbs I connected my gun to the gashose and pumped. Did it several times. The were holding the pressure until app. 7,5 psi. Then two of them started to leak. At 9 – 10 PSI all leaked.
But thats much more pressure than the MC-gastank can put on the carbs, so I think its fine.
The mechanic I spoke to may apparently have other experinces than some of you. He advised me never to try to pull the seats up as Iīd never get them gastight again.
Has any of you got any picture that show were the O-ring is situated on the CVK34? How do you get them separated from the carbs?

I did have a new experience though……. The angel of these carbs had a very big impact on the tightnes of the needles.
I assumed that the gaslevel mentioned in the manual (max at 1 mm above the carburettorbody) should be measured with the carbs on the MC OR!!! Dismantled BUT with the same tilt/angle as on the bike. IF I keep the carbs horizontal its very ease to keep the fuel height in accordance with the manual. In fact the gaslevel was a bit lower than in the manual.
Another thing I found out was, that even if the floats are at app. 17 mm above the body when they start to affect the needles (in accordance to the manual) there were a big difference between especially one of the floats height and the others. Thought this was very odd so I diamantled the one and one of the others. I also think there is a difference in the spring”tightnes” when I compressed them with a finger. Reassembled though. I have to check other things before I reassemble the bike, so I canīt give a repport on how successfully the mechanicing was ;-)
Although i am three years late, but i am having the same problem, i need help to find some things to set up my float height and float timing.

1. What should be the angle at which the carburetors are to be placed at.

The service manual should have the float height along with the "angle" at which the carburetors are to be placed on the bench, this angle represent the seating position of the carburetors when they are installed on the bike.

As per my past experience if you place the carbs (on the bench) at the specified angle and set the measurement of the floats to the specified values, the float timing shall be perfect.

Would be great if you could help me in this
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