Quote:
Originally Posted by JWL
If the number 57 jets are the original design I would be surprised if the engine will run with 51's in it unless the power valve is continuously open. I have found the factory calibration to be VERY close on 390, 465, and 600 carbs when attached to our flatheads.
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I 100% agree. I don't understand how some say because a carburetor is bigger (air flow) that it will be richer. All carbs are calibrated (originally) to be in the ball park as far as the correct mixture ratio. Always use original factory jetting as a starting point and a power valve based on how radical of a camshaft you have.
Sal