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need some carb tunning advice

  • Thread starter Thread starter Qckslvr
  • Start date Start date
Q

Qckslvr

Guest
Ok so I need some thoughts on carb tunning.

What we have is a 1978 GS750 with K&N pod filters and a Kirker 4-1 system.

The carbs are stock Mikuni VM series carbs. Rebuilt them with new o rings and gaskets.

The stats
Floats set at 25.5 mm
Main Jet 107.5
Jet Needle clip set in middle ring (was at top)
Pilot fuel screw 2 turns out
Pilot air screw 1.5 turns out

The issue, bike has a mid range flat spot. Off idle it takes off like a rocket, hits about 5k and brick wall, rap it WoT and off it goes again. So I am thinking of raising the needle 1 more clip.

Thoughts?
 
Forgot, can I remove the needles in the bike without removing the throttle shaft?
 
My thought is

Your main jet's too small (should be more like 115)

The fuel screw should be about 1 turn out

How big is your pilot jet?

Wouldn't hurt to raise the needle a notch, that's what controls the midrange
 
Big T said:
My thought is

Your main jet's too small (should be more like 115)

The fuel screw should be about 1 turn out

How big is your pilot jet?

Wouldn't hurt to raise the needle a notch, that's what controls the midrange
Click to expand...

pilot jet is stock, which BB says is a 15. I don't recall seeing a number on it.
 
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