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TOPIC: kz650 bogging down after a few miles

kz650 bogging down after a few miles 16 Feb 2019 17:02 #798789

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It would be a good time to spray out your carbs and get new o-rings and float bowl gaskets.

Are those VM carbs? if so this guy sell a high quality VM o- ring set for around 23 bucks delivered. www.cycleorings.com/VMkit.html
I know it says Suzuki but they used the same Mikuni carbs.
They fit right in my VM's and I have extra sizes left over , around 40,000 miles on them with no trouble
You would still need to get float bowl gaskets elsewhere
But first make sure you have the VM24 carbs like 79 has.

Patton posted very helpful diagrams on how the flush the passages but I can't find them yet
78 KZ1000 A2A

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kz650 bogging down after a few miles 21 Feb 2019 12:55 #799001

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So I have taken the carbs off (and installed the airbox, which was a pain) and opened the bowl of the carb that was leaking gas from the pod filter. I then opened the bowl that was to the right of it, which would be up hill to it if it was sitting on the kickstand. The floats were not stuck, but I did find something.

These two little pieces were in the bowl of the rightmost carb. I found where they go, but I am missing this little retention clip thing (picture 3 shown).

What is this tiny piece, and could it being missing from carb #4 cause gas to leak from the air filter of carb #3?

Thanks for the help, I do appreciate it.
'80 kz650 LTD
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kz650 bogging down after a few miles 21 Feb 2019 13:18 #799004

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Those are part of the accelerator pump. See numbers 18 and 19 in the parts diagram.

www.partzilla.com/catalog/kawasaki/motor...erator-pump-kz650-b3

That float bowl looks pretty dirty. That is just the sort of stuff that can prevent the float valve from sealing and create the overflowing problem you have.
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1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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kz650 bogging down after a few miles 21 Feb 2019 13:21 #799005

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Looks like you lost a tiny Little circlip. Never seen this vent or valve mechanism in a carb bowl.
BTW you have a lot of rust particals in your carb bowls, check your fuel tank.

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kz650 bogging down after a few miles 21 Feb 2019 13:25 #799006

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Oh yeah it is dirty, and my tank was rusty too. It look like its a 1 way valve for fuel. I will need to clean it.

Where could I get another?
'80 kz650 LTD

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kz650 bogging down after a few miles 21 Feb 2019 13:28 #799007

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You have to search for part# 92037-1123
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kz650 bogging down after a few miles 21 Feb 2019 13:49 #799009

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I found some for sale for $10 which seems like kind of a rip off, especially with $4 shipping (Like come on it could fit in an envelope) I made one out of a spring from a pen, would I be stupid to accept this as a solution? I don't really like doing janky things, considering the PO's janky things are what I am trying to resolve.

It does work, it rattles the same way the other one does, and the valve still works properly.
'80 kz650 LTD
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Last edit: by Cabbagio Redentor.

kz650 bogging down after a few miles 21 Feb 2019 14:45 #799014

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If it´s works for you give it a try and save some unnecessary money you have to pay for. thumbs up.

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kz650 bogging down after a few miles 22 Feb 2019 15:29 #799079

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My gaskets looked healthy, so I'm leaving the old ones. I cleaned them up and put them back together. I put the carbs on, and then put on the rubber airbox hoses on from inside the airbox. I reached in where the lid goes and stuffed them in from there.

Unfortunately they are not long enough to properly work. They just barely sit on the air intake part of the carb, while they should be on there more than a few mm. I slid the airbox as far forward as it would go while still attached to the battery box.

I think they must have shrunk, since the little notch on 1 and 4 is not even close to the peg on the airbox to stop them from rotating. Its an odd situation.
I guess I have to buy new ones, althoughI'm gonna borrow a heat gun and try to use that to get them all the way on first.

She does start and run though, although I have no intention of actually riding with those hoses barely on there.
'80 kz650 LTD

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Last edit: by Cabbagio Redentor.

kz650 bogging down after a few miles 22 Feb 2019 16:00 #799082

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Are you sure they are in the right position in the air box? There are raised parts with a groove in the middle that air box fits into. If not installed correctly the boots will be too short.
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kz650 bogging down after a few miles 22 Feb 2019 19:55 #799094

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The airbox is sandwiched between the two ridges on the boots. I'll post some pictures tomorrow.

I just can't get them to go on any further.
'80 kz650 LTD
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Last edit: by Cabbagio Redentor. Reason: Adding image

kz650 bogging down after a few miles 27 Feb 2019 08:52 #799335

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I got my new hoses in, they definitely confirm that mine have shrunk.

The first picture is the old one next to the new one to show the change in length.

The second picture is me stacking them and squishing to show the difference in flexibility. I pulled the old ones out through the airbox and will push the new ones in. I am going to soften these further with a soak in some warm water.

EDIT: Got em on, piece of cake. I just need to get the valve clearance adjusted by a pro, and then she should be good to go for an actual cleaning and some touch up on the frame.
'80 kz650 LTD
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kz650 bogging down after a few miles 27 Feb 2019 13:09 #799345

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Cabbagio Redentor wrote: The bowls do have drains to clean them up. I'll clean the tank and get a new filter. I really should do that anyway even if I had no issues. I'm trying to avoid messing with the carbs too much until I get the rest of the airbox pieces and slap that on there so I don't just have to tune it again.


The tank may surprise you. I cleaned and treated mine, I thought really well. Couple of months later I had problems similar to the one you describe. Pulled the petcock and the screens were gunked.
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