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Float bowl heights

tas850g

tas850g

Forum Mentor
Can float bowl heights create extreme bogging when throttle is turned? The only way i can get a descent idle to check high rpm air screws is to have atleast 1/2 choke applied. Anything less and it will die with throttle turned and you can hear the need for more air from carbs if that makes sense. The fuel screws are turned 1/2 out and air are turned 2 - 2 1/2 turns out. It is a 79 GS 850. I have read that this are lean to begin with. Specs say 5/8 turns out for fuel and 1.25 for air. I know i am doing something wrong but trying to be patient.
 
Try one turn on the fuel and 2 on the air. Of course, messing with the screws is a waste of time unless you have cleaned the carbs properly and replaced the various o-rings inside and on the carb boots as well.

Good luck.
 
tas850g said:
The fuel screws are turned 1/2 out and air are turned 2 - 2 1/2 turns out. It is a 79 GS 850. I have read that this are lean to begin with. Specs say 5/8 turns out for fuel and 1.25 for air. I know i am doing something wrong but trying to be patient.
Click to expand...
You know it ran lean to start with, you have the fuel screws turned to less and the air screws turned to more and you wonder why it sounds lean? :-k

You have taken a stock lean condition and really aggravated it. Try settings as Nessism has suggested. If the carbs are properly cleaned and synched, you might get by with 3/4 on the fuel and about 1 1/2 on the air screw, but you definitely want more than the stock 5/8 on the fuel screw. Wherever you set the fuel screw, set the air screw at double that. When the bike is fully warmed up, slowly turn each air screw, listening for the highest engine rpm.

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i did clean the carbs, one day soak for each body, all new o-rings including intake boot. I tried the 1 turn fuel and 2 then 2 1/2 turns air and still bogging on idle throttle response. With 1/2 turn fuel and 2 turns air screws the carbs show fuel on the carb/airfilter intake. I took off the carb rack and there was fuel on/around the intake boots. So i am thinking there is still too much fuel to the carbs. The plugs are now carboned up rather than white when i had 1 turn fuel and 2 1/2 turns air screws. I am going to tear the carbs apart again to see if something is up with them internally (air/fuel screws, jets, etc). It just seems there is not enough air getting to the carbs. PATIENTS! Thanks for the advise, i greatly need it.
 
Yes, PATIENCE will definitely come in handy here. Since you already plan on taking the carbs off again, make sure that none of the jets have their tips broken off. The fuel jets have rather long, skinny tips that are easily broken. You should be able to feel the tip in the carb outlet when they are lightly seated. If you can't feel the tip, it might be broken, allowing too much fuel, assuming the tip is not stuck in the port.

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