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GSX750ES 1985 : Setting the carbs battery in place

  • Thread starter Thread starter dpascal
  • Start date Start date
D

dpascal

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I finished the carbs rebuild according the fantastic "Mikuni_BS-CV_Carburetor_Rebuild_Tutorial" which i executed very thoroughly.
When coming to put the carbs battery in place I faced the following questions and the manual doesn't help :

1. In the attached picture there are 3 nozzles. The middle one is the fuel line. Do I need to connect the 2 side ones somewhere ?
2. I accidentally connected the fuel line to the right nozzle causing a spill from the air-box. Could this damage the diaphragm or cause any issue ?
3. Before putting the carbs in place, is there a setting or a calibration of a jet (pilot jet) that needs to be done before mounting the whole carbs battery in place and cannot be done afterwards ?
4. Putting the carbs in place with the original air-box is nightmare. Any secret here to make it easier ?
5. Is there a thoroughly documented procedure that shows how tune the carbs or how to set them after rebuild ?

DSC_2563.jpg
 
Last edited:
6. What is the preset of the air screw ? how many turns towards open from a fully closed position ?
 
1) Attach some lengths of tubing to those two breather hoses and then route them up to a safe place by the airbox.
2) No worry
3) No
4) Loosen airbox and slide back. Cram carbs in front of airbox and then attach the airbox boots to the backside of the carbs. Lastly, move the carbs and airbox forward together and put the carbs into the rubber boots on the engine.
5) Factory service manual shows how to vacuum sync carbs and assure the throttle cable has a little slack. Set the pilot screws to 2.5 turns open per the rebuild tutorial guidelines.
 
"Set the pilot screws to 2.5 turns open per the rebuild tutorial guidelines."
Thanks Ed!
These are pilot screws, right (marked by the red lines in the picture) ?
By the way...I initially thought you meant pilot jets. Naming is confusing...

DSC_2571.jpg
 
Correct. Mikuni and Suzuki both call those parts Pilot Screws because they affect mixture through the pilot system.
 
There are some here that also call them "mixture" screws, because they do not only control air or fuel, but a mixture.

The pilot fuel jets are in the float bowl, next to the main jet, and are covered with the rubber plugs. They should be installed snuggly.
The pilot air jets are in the inlet of the carb, shown in your first picture at the 8 o'clock position. They should be installed snuggly.

The only adjustable items are the pilot (mixture) screws, the synchronization screws between the carbs and the master idle speed screw.

.
 
As far as mounting the carbs / airbox goes, my EF had metal retaining spacers inside the airbox rubbers - which meant it was near impossible to remove or install these with the carbs anywhere near them.

What I ended up doing was getting a wood saw (or something else that is thin, broad and flat) and placing this against the airbox rubbers. Then I slid the carbs back in pushing back against the saw / airbox to allow the carbs to slot in the intakes. Once seated, you could slide the saw out and push the airbox back onto the back of the carbs.
 
Steve said:
There are some here that also call them "mixture" screws, because they do not only control air or fuel, but a mixture.

The pilot fuel jets are in the float bowl, next to the main jet, and are covered with the rubber plugs. They should be installed snuggly.
The pilot air jets are in the inlet of the carb, shown in your first picture at the 8 o'clock position. They should be installed snuggly.

The only adjustable items are the pilot (mixture) screws, the synchronization screws between the carbs and the master idle speed screw.

.
Click to expand...

"... and the master idle speed screw"
This is the shiny knob seen in this picture, right ?

Screenshot_2017-10-28-09-08-52.jpg
 
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