Wont idle?

[Christopher]

Hello Im recomisioning a GS850GN standard exhaust and original airbox and slide carbs. Cleaned carbs a few times.I replaced rubber boots engine to carb and carb to airbox. It idles on full choke but dies when I rev it.Ive turned idle screw to full. Its revs up when I really slowly turn throttle. If i put it in gear and rev it just dies. Im thinking it has an air leak maybe the airbox - cover gaskets are not in best condition. How can i test this. Can airbox leak around where the pipe enters coming from rocker cover? How to test? Any advice appreciated thanks Guys?

[Nessism]

First off, did you take the carbs fully apart and soak the bodies in carb dip or a good ultrasonic? Shoot carb spray through every passage and confirm it comes out where it's supposed to? Hold up the pilot jets to a light to make sure the orifice is open? Verify the choke tube is clear? Verify the choke passage in the float bowl is clear? Replace all the various O-rings in the carbs? Open the pilot fuel screw to 3/4 of one turn open, and the air screw to double that? Mechanical sync the carbs?

[Christopher]

Thanks Nessism for your response. Ive cleaned the carb jets and sprayed carb cleaner through all the passages. Havent yet disassembled carbs and used an ultrasonic and replaced o rings. etc. Is there a tutorial to advise steps you have listed for VM Carbs off a GS850GN?

[mpidsadny]

There are carb rebuilding guides on BikeCliffs website. I found them incredibly helpful for reassembly and cleaning.

[Rich82GS750TZ]

BikeCliff's Website in the first link in my signature. Follow the Link and search for the VM Carburetor Rebuild Guide. Below the Manual Section, 3rd link down in the right column of files. Or just follow this link.

https://gsarchive.bwringer.com/bikecliff/images/vm_carb_rebuild.pdf

[salty_monk]

Thanks Nessism for your response. Ive cleaned the carb jets and sprayed carb cleaner through all the passages. Havent yet disassembled carbs and used an ultrasonic and replaced o rings. etc. Is there a tutorial to advise steps you have listed for VM Carbs off a GS850GN?

This... you need to do this

After that replace the Intake boot O'rings and make sure there aren't air leaks elsewhere. Nessism could be your source for O rings...