I have a stock 74 F11 that works correctly. I can let the clutch out at idle. It pulls very well down low then just fades away on top. It was designed as an enduro and should pull down low for riding in the woods.
Sounds lean. Check for air leaks, ignition side of crank, rubber mount for carb, wrong jets ( sometimes aftermarket jets are bad ) float not set correctly, needle in correct position.
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