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At steady 65mph what fuel circuit am I using?

  • Thread starter Thread starter andmoon
  • Start date Start date
A

andmoon

Guest
I don't think I am past 1/4 turn of the throttle.
Am I on the pilot jet or on the needles?

83 850g.
Slight surge at constant speed above 3K rpm.
Great under load and very slight popping on decel.
I think I am lean but not sure if it is the pilot jet or needle.
 
andmoon said:
I don't think I am past 1/4 turn of the throttle.
Am I on the pilot jet or on the needles?

83 850g.
Slight surge at constant speed above 3K rpm.
Great under load and very slight popping on decel.
I think I am lean but not sure if it is the pilot jet or needle.
Click to expand...

Is your exhaust system sealed?
 
1 part pilot circuit plus 2 parts needle circuit shaken not stirred.
Anything over idle is mostly needle until you hit 3/4 throttle and up is main.
 
chef1366 said:
1 part pilot circuit plus 2 parts needle circuit shaken not stirred.
Anything over idle is mostly needle until you hit 3/4 throttle and up is main.
Click to expand...

Not quite true , Mr Bond. :-\\\ I vote at 50/50 too. But it depends on the state of tune of the engine. Lower CR's and poorly timed engines could equate to 1/3 to 2/3 values as you have hinted at. ;)
 
you are running on a combo of 2 circuits

the bypass circuit (fueled by the pilot jet and pilot air bleed)
beginning of the needle jet/jet needle and main emulsion tube
 
Raise the needle or go up one size on pilot jet?

Bike runs great up to ~ 3000 rpms and under load even if it is slight.
Worst when holding steady speed on very slight decline. No issues on inclines.

Valves synced, carbs synced.
air screws out 3 turns.
 
Are you running a stock intake and exhaust? You really shouldn't need to increase any of your internal carb component sizes if you are.
 
drhach said:
Are you running a stock intake and exhaust? You really shouldn't need to increase any of your internal carb component sizes if you are.
Click to expand...

Bike came to me w/ aftermarket mufflers, stock intake and a really messed up dynojet jet kit installed VERY wrong.

I have stock jets and needles back in.

I have a feeling the free flow exhaust may be making the bike lean.
 
fixed!

raised the needles 2 notches.

I think the PO just blindly put in the largest jets and needles from some dynojet kit. Not sure if the kit is even for the GS 850.

I think I have it back to stock minus the needles. Pics of the stock needles I've seen didn't show the stocks as having slots for raising and lowering the needles. The needles in my bike has 6 or 7 slots.

Gracias all
 
andmoon said:
fixed!

raised the needles 2 notches.

I think the PO just blindly put in the largest jets and needles from some dynojet kit. Not sure if the kit is even for the GS 850.

I think I have it back to stock minus the needles. Pics of the stock needles I've seen didn't show the stocks as having slots for raising and lowering the needles. The needles in my bike has 6 or 7 slots.

Gracias all
Click to expand...


Stock needles in my GS didnt have notches either.

Glad to know you got it corrected with the needles, just as many suspected.
 
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