Check to make sure that the bushes in the ends of the butterflys are not worn which makes the butterflys sloppy.
An easy way to (might seem rough but works very well) set the butterflys is to open the throttle to 40-60% and hold/jam it there.
If you have access to a good set of Fractional drills you can then proceed to match the openings by slipping a fractional drill down the throttle/butterfly gap. The fractional drills go up in .1 increments so you can get a very accurate match.
The 40-60% opening corresponds to the most used area of the throttle.
An easy way to (might seem rough but works very well) set the butterflys is to open the throttle to 40-60% and hold/jam it there.
If you have access to a good set of Fractional drills you can then proceed to match the openings by slipping a fractional drill down the throttle/butterfly gap. The fractional drills go up in .1 increments so you can get a very accurate match.
The 40-60% opening corresponds to the most used area of the throttle.
