Help a newbeginner..

Yes, each mixture screw should have a spring and an o-ring.
The diagram at the link below is for the 1980 U.S. version. Yours should have numbers 42, 43, 37 combo shown in the box.

www.kawasaki.com/Parts/PartsDiagram/143240/1980/KZ650-F1

1, VM24 ??
I can see some of you make referance to VM24, are we sure these is the model I have?
On another thread on these forum have I been shown a picture to determine VM22 og VM24, and for me it looks like
I have VM24, please see attached pictures. But when I measure the size of the small pipe end I got almost 26mm, please see attached pictures.

If so can I use these spareparts list?
www.kawasaki.com/Parts/PartsDiagram/143240/1980/KZ650-F1

2. Jets
I have now read what size the jets are, please see attached picture.
125 and 25 ??
Is these reasonable ?
the last owner says he has drive the bike last 5-6 seasons with these setup without any problems?

The 81 KZ650-H1 diagrams might be more appropriate. (the 80 F1 are probably similar, though)
The 81 650 came stock w VM24 carburetors & the carbs in the photos appear to be the same.
Measure the inside of the carb bore near the throttle slides. It should be 24mm.
The approximate 26mm measurement you're showing is normal at that point.
The jet sizes are probably close, but you might need larger main jets. maybe not, though. just guessing.

Hi, thank you for your time helping me out,

www.kawasaki.com/Parts/PartsDiagram/143240/1981/KZ650-H1
These is the diagram you mean is best to use for me? I can order parts according to it?

Measure the inside of the carb bore near the throttle slides
I`m correct place, but just deeper inside the whole? close as possible to the throttle slides, correct understood?

I will try with the jets I have then take it from there... Must trust the last owner in first place?

My apologies. Use the correct year diagram.

martin_csr wrote: Why don't you use the 81 KZ650-H1 diagram? (the 80 F1 are similar, though)
The 81 650 came stock w VM24 carburetors & the carbs in the photos appear to be the same.
Measure the inside of the carb bore near the throttle slides. It should be 24mm.
The approximate 26mm measurement you're showing is normal at that point.
The jet sizes are probably close, but you might need larger main jets. maybe not, though. just guessing.

gordone wrote: ...
Measure the inside of the carb bore near the throttle slides
I`m correct place, but just deeper inside the whole? close as possible to the throttle slides, correct understood?
...

Yes, but measuring probably isn't necessary as those are VM24 carburetors. You can tell by the ribs on the carb bodies.

1979 KZ650 VM24 carburetors w accelerator pump.
i.imgur.com/0SmxFe2.jpg ... i.imgur.com/OuQ8Kj7.jpg .... i.imgur.com/b52Epan.jpg ... i.imgur.com/XW3LdlG.jpg

ps: as TexasKZ mentioned in his first reply, you might want to get KZ750 carburetors & install an airbox.

martin_csr wrote:

gordone wrote: ...
Measure the inside of the carb bore near the throttle slides
I`m correct place, but just deeper inside the whole? close as possible to the throttle slides, correct understood?
...

Yes, but measuring probably isn't necessary as those are VM24 carburetors. You can tell by the ribs on the carb bodies.

1979 KZ650 VM24 carburetors w accelerator pump.
i.imgur.com/0SmxFe2.jpg ... i.imgur.com/OuQ8Kj7.jpg .... i.imgur.com/b52Epan.jpg ... i.imgur.com/XW3LdlG.jpg

ps: as TexasKZ mentioned in his first reply, you might want to get KZ750 carburetors & install an airbox.

I don`t have w accelrator pump, please see attached picture.

Just to make it clear the carbs was installed on the engine when I took over the bike, and the last owner says he have driven the bike with these setup for 5-6 seasons. Please see pictures added where the carbs is installed on the engine.

So it wast of time for me to use these carbs? I had the understanding that people saying eraliere that these shall work as long I have correct jets and no air leaks on the vackum, these information also correspond to owner before me also inform about.

Is it hard to tell if shall work or not? If not must I by new one and sell them, but don`t want todo it I don`t need.

I start to get Impatient to come further

www.kawasaki.com/Parts/PartsDiagram/143240/1981/KZ650-H1
Can I use these diagram for order parts to by carbs, if so witch shops on internet can you recommend?

These 24mm carbs should work pretty decent on this even though if its a 750....... Baldy110 has his 650 bored to 810 and still uses these stock carbs. They are working on my set up very good too. I would listen to whats been said by Martin, Steve, Texas etc........ try capping off the vac fitting on #2 carb like on the #4 carb and running the bike on prime like Texas says to eliminate the fuel valve giving you a problem...... (I did this for years before springing for a valve) the jetting sounds rich to me I have 17.5 pilots and a 117.5 main with the clip on the 5th bottom groove and if I remember baldy's no richer if not less so. Maybe 17.5 pilots ...."but try all else first" !!

Your on the right track clean, spray and blow air through the air jet and pilot jet areas over and over ( many problems like you describe are solved here)...... do 1 and 1/4 to 1 and a 1/2 turns on the air screw (mine at 1 and 3/4 is pretty close for me) synch em, check the valves like Steve says too. Hoping the carb holders are not leaking. Z1 is a good place for jets... a few o rings maybe later but not until you get it closer to running good.

No eBay APP ID and/or Cert ID defined in Kunena configurationThank you verry much for the respson!

I`m planing to by new fuel valve, so the valve is not any problem in the future

I have now almost complete my rebuild of the carbs... hope they will work hehe
It tooks some time to locate parts on internet etc...

I have followed these guide for rebuild of the carbs:
temp.dynamitt.net/div/MC/carbs/vm_carb_rebuild.pdf

I have uploaded some pictures here from the work:
temp.dynamitt.net/div/MC/carbs/

I have one questions for you all
Page 9 Fully open posistion, I shall check that sldies is around 0,5-1mm above the top of the intake chamber. I think I have understood these, but are now 100% sure, please see these video I have recorded:
vid.me/Z52e

Is these correct? shall the slide stop like these?

Thank you for taking time looking into these!

Next step for me is to put som temp. paint on the gas tank... adjust valves.. and then tune carbs... hopefully will I have a bike for the summer and start new project late summer

I have written on different threads, but since these threads has been used for carbs and motor condition will I contiune here.

1. I have adjusted the valve clearnes.
2. I have rebuild the carbs with new o-rings, gasket etc..
3. I have tried to get correct float height on the gas in the resorvar, these was not so easy.. but I have found a okay level now I think,
3 og the carb is on the top where the resvoar change size, where the screws is, and one if lower, but not much.

Task Today:

Task 1:
I installed the carbs today, and the bike started easy. I have folowed attached carbs rebuild guide.
Point 36 "Turn each pilot air screw slowly (both ways) up to one full turn until you hear the engine speed max out. ........
Please see attached guide for complete point 36.
I found these diffecult it was not easy to hear the engine rise, If I turned the screw to the buttom the engine was slowing down and and new sounds... And if I turn it out 1 turn + I could hear it starting up again... but I dident experience the RPM was going higher and higher...
The engine was not going 100% on the same RPM either, but it was not many 100RPM different...

Have I done something wrong ???
I don`t think I have gone these mix screw tuning perfect... must try to get some experience from poeple inside here and read more and do some more attemps...

Now they are 1 turn out pluss 1/4 maybe..

Task2:
I was going further and did carb sync, see attached video.
I think I was doing these correct, I adjusted so the the gauge was showing almost identical on all 4 carbs when I give throttle and idle... ?

Video:
temp.dynamitt.net/div/MC/IMG_3684.MOV

Task 3:
Test drive, First must I say that I`m not a experience driver, I`m working on my licens now, and the driving I have done until now is the on the school bike who is new and don`t have carbs.

1. When I was driving the bike it was running smoth up to 4k RPM, not problem.
2. If I give full throotle It`s not respons with full force, You can hear it "want" to give full force, but cant`t... almost like a sound you
"choking" and it has bad timing... But if I only give around 50% it acc. nicely with good speed and no issues...
3. If I example acc to 4K RPM and when goes up to 4,5 it was going okay and then go to 5 it was okay.. so if I was going slowely the bike was running better...
4. eraly on the test drive the point 3 was not identical, It was going smoth between 1-4K, but over 4K it start "popping" in the carbs and it was not running smoth.
5. I have tested running up to 6-7K RPM and it was running okay, but I need to take it up to these RPM slowely.

Maybe these is confusing how I write it.. hehe

How smoth shall the engine be ? what is the goal ?

You are running to lean with pod filter.
Your jet # are for stock air filter and housing.
check your spark plugs



Michael