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Round head fueling.FIXED!

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GuzziNZ:
What would cause a surge/stutter under load and full throttle from 4 to 5000rpm in a 850T?
From 5k on its clean all the way up to redline.
Starts with one tap on button and smooth idle and town running.
Bike had been running great, removed carbs when I had crank balanced and problem started after fitting.
Excellent compression and have changed complete ignition system.
VHB30. Standard Jets, needle at second notch, 10g floats set a 24mm. New red tip float needles.
Choke plungers have depressions marks in rubbers but no signs of over fueling

moto:
Surge and stutter seem like two different things to me. Can you describe the symptom in more detail?

wirespokes:
The question I have is what was done before the symptoms arrived? It was running great, then the engine was torn down to the crank, rebuilt, and at the same time the carbs were overhauled. That's quite a lot to think with. Even though nothing but the crank balance was changed, in a way, everything was. So forget about finding what was changed by looking back and fixing it, since everything was.

It's highly unlikely the problem is electrical, most likely carburetion. Something in mid-range jetting I'd guess.

GuzziNZ:
Is more like a stutter or goes fluffy if you want to be technical!
Borrowed a dyna system to rule out ignition and dialed up the cam timing again.
Had a closer look at the choke plunger,s and they are not that good. Have turned seals over and will give it another go.

GuzziNZ:
Still no good. Only thing I am noticing apart from not wanting to rev is to get the best idle the RH mixture screw is only one turn out. Book says 2-2 1/2. LH is 2 out as per the book.
Also the exhaust gas out of the RH muffler is warmer!

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