I have one carb backfiring. evidently there aren't high/low speed adjustments for rich and lean conditions. Just different size needles to adjust? Is that right? I have tried plugging both jets with my fingers and no change. I have cleaned main jet with compressed air, doesn't appear to be plugged. When revved a visible stream can be seen going into the throttle body comparable with the other carbs. any ideas? Here's a link to the video https://youtu.be/19bGKl0KDrc
thanks
thanks