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Need Source for mixture screws

  • Thread starter Thread starter gentlemanjim
  • Start date Start date
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gentlemanjim

Guest
1978 GS1000 VM Carbs. I need new mixture screws. bought some form Bike Bandit, but they are not correct.

Looks like this, tip a bit broken off. Note: "O" ring as at the back of the threads.
 
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Those are PILOT screws...MIXTURE screws are on the sides. As stated above, Z1 has them..listed as KZ1000. The stem is a bit longer on the KZ needles but they tappered pointed end is the same.;)
 
chuck hahn said:
Those are PILOT screws...MIXTURE screws are on the sides. As stated above, Z1 has them..listed as KZ1000. The stem is a bit longer on the KZ needles but they tappered pointed end is the same.;)
Click to expand...

So you are saying check for the parts for a Kawasaki pilot screws? That is great news. Thank you.
 
I am not saying all KZ 1000 carb parts interchange with Suzuki...i am just sayingb that the KZ 1000 pilots will be just a bit longer than Suzuki ones and will work exactly the same.
 
gentlemanjim said:
So you are saying check for the parts for a Kawasaki pilot screws? That is great news. Thank you.
Click to expand...

Just call Z1 and tell them you want pilot FUEL screws for a VM carb

The #18 in the fiche are pilot AIR screws

Too much intermingling of imprecise terms here
 
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Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...

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chuck hahn said:
Those are PILOT screws...MIXTURE screws are on the sides.
Click to expand...


Too much confusion exists already.

Those are Pilot Fuel Screws. Pilot Air screws are on the sides up high towards the rear.

One controls fuel into the pilot circuit, the other controls air.


Mixture screws are on CV carburetors, they are different in function.
 
Actually Tom...not one article from Mikuni that i have ever read calls them PILOT AIR SCREWS . They are refered to as mixture screws because they MIX air with the fuel to either richen or lean the MIXTURE...thus the term MIXTURE screw. And a PILOT screw simply meters fuel into the pilot circuit..turn in to lean the pilot circuit and out to richen the cicuit.
 
From the serice manual at Bikecliff...the part descriptions from the carb schematics, part number 18 "ADJUSTER" And as i said before, Mikuni referes to it as a mixture screw. There was a line or two in the manual however where SUZUKI called it an air screw.
 
chuck hahn said:
Actually Tom...not one article from Mikuni that i have ever read calls them PILOT AIR SCREWS . They are refered to as mixture screws because they MIX air with the fuel to either richen or lean the MIXTURE...thus the term MIXTURE screw. And a PILOT screw simply meters fuel into the pilot circuit..turn in to lean the pilot circuit and out to richen the cicuit.
Click to expand...

No doubt there is alot of confusion over the correct names for these screws. I checked the service manual which just shows an exploded view and just calls them adjusters, item 18 on page 8-6.

Now the parts fiche refers to them as "Pilot Air Screws" also item 18.
http://www.boulevardsuzuki.com/fich...y=Motorcycles&make=SUZUKI&year=1978&fveh=2146

Then we got Paul Musser's VM Carb Rebuild Guide that also refers to them as "Pilot Air Screws" on page 4.
http://members.dslextreme.com/users/bikecliff/images/vm_carb_rebuild.pdf
 
Only air goes through it, it is an air screw. The fuel screw, only fuel goes through it, it is a fuel screw.

On the CV carbs, a premixed fuel air mixture goes through the screw, therefore it is a mixture screw.

Three entirely different concepts, three different names.
 
Go back and read each sectional break down. The PILOT supplies a premetered MIX of air and fuel. The bleeder tube supplies the air to the main cicuit to be mixed with the fuel. The ( air, mixture, flux capacitor, humidity, or whatever esle you wanna call it) meters the mixture in the main circuit..just the same as the pilot screw meters the premetered mixture at low speeds and at idle. When you adjust the screw on the side it adjust that mixture of air to fuel supplied in the main circuit..yes it adds or removes AIR, but that not what the carb manufacturer calls it..I am not arguing WHAT it does,,,I am arguing its correct name that MIKUNI calls it. After all, they manufactured them and named them so I will go with thier terminology.
 
chuck hahn said:
Go back and read each sectional break down. The PILOT supplies a premetered MIX of air and fuel. The bleeder tube supplies the air to the main cicuit to be mixed with the fuel. The ( air, mixture, flux capacitor, humidity, or whatever esle you wanna call it) meters the mixture in the main circuit..just the same as the pilot screw meters the premetered mixture at low speeds and at idle. When you adjust the screw on the side it adjust that mixture of air to fuel supplied in the main circuit..yes it adds or removes AIR, but that not what the carb manufacturer calls it..I am not arguing WHAT it does,,,I am arguing its correct name that MIKUNI calls it. After all, they manufactured them and named them so I will go with thier terminology.
Click to expand...

I looked and couldn't find a web-site for Mikuni, but I have no problem taking your word for it, that is the function of the screw. What I do know is the service manual is pretty weak. All it says about those screws is they're set at the factory and don't mess with them as you'll never get them back to factory settings. Also, did you know you can kick over the engine on the GS1000! News to me, I know that because it says so in the service manual, yes page 8-3 third sentence.
Did I say I thought the service manual was weak?
But, one thing I don't fully understand, and this is going in a different direction. It's still GS1000 carb related though. And that concerns sync'ing. I have read before that cylinders 2&3 are supposed to be sync'd at a different level than 1&4. Fig 8-32 shows it and the narrative is last paragraph on the previous page. OK, I understand that, my question is how do you compensate for those different levels if you do use a different sync tool? A non suzuki sync tool without those steel balls, how do you compensate for half a steel ball's difference on analog needle sync tools? All the pic's I've seen from folks here show all carbs sync'd to the same exact levels. Just had to ask as I've been thinking about that for the longest time.
 
It is something to do with the crossover in the exhaust, if you don't have that anymore set them all even. I have tried with them slightly higher, and with them all the same, cannot tell the difference in how the bike runs. Maybe it's one of those things that will affect gas mileage by one percent or so but otherwise it doesn't matter at all?

I don't know.
 
tkent02 said:
It is something to do with the crossover in the exhaust, if you don't have that anymore set them all even. I have tried with them slightly higher, and with them all the same, cannot tell the difference in how the bike runs. Maybe it's one of those things that will affect gas mileage by one percent or so but otherwise it doesn't matter at all?

I don't know.
Click to expand...

Ah, that didn't cross my mind but makes sense. I thought it might have had something to do with the middle two cylinders running somewhat hotter because of their location. But with the two center cylinder balls being lower I would think that would be a leaner condition, or do I have this backwards?
 
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