79 850 carb issues

[Jwhit89]

Hey all,

i am very new to the gs world, I’ve recently acquired a 79 gs850 from a co worker that was not running. I got it back the house, adjusted all the pilot screws to what the carb faq specified, got the bike running but it was spewing enough gas to fill the filter up (stock air box) it would run ok flat ground but on inclines it would die. The carbs were apart cleaned and rebuilt using a Japanese kit from eBay per the previous owner. My question is I have the factory jets and parts he replaced, should I re o-ring them and install or should I attempt to tune the new stuff he put in? I also found the fitting for the fuel line between the two inner carbs rotates relatively freely, is this normal? Thanks I’m advance for any advice I’ve spent over a week obsessively researching these carbs but still need some advice specific to my issues.

 

[Nessism]

You need to 100% tear the carbs apart, soak all the hard parts in carb dip, then inspect everything and reassemble with new O-rings and bowl gaskets. Pay special attention to the condition of the float valves and replace them with quality parts if necessary. When done, do a wet fuel level test like shown in the factory service manual. Needless to say, all the jet sizes need to match those in the factory manual, assuming you are using the factory airbox. The carb boot O-rings will have to be replaced, and the replace the boots too if they are hard.

https://gsarchive.bwringer.com/mtsac...ing_Series.pdf

https://gsarchive.bwringer.com/

 

[Jwhit89]

Nessism thank you for your help! I disassembled, cleaned, and reset everything to factory specs and it started first try! Now onto tuning and checking plugs!