i have a 1998 Yamaha warrior 350 with stock Mikuni carb that I'm rebuilding. My accelerator pump keeps binding after I tighten all four float bowl screws. I've replaced the spring with a stronger bic spring, it moves freely until I tighten the four float bowl screws fully. I've tried tightening the four screws in different order in case that was the issue but no luck. I've tried installing it with the boot and without the boot but no change. Any help would be appreciated. I don't think the accelerator pump is bent so I'm not sure what I'm doing wrong.