95 Big Bear 350 Carb Questions

I have a 95 big bear with a mikuni carburetor and unfortunately the previous owner tightened the fuel mixture screw down to the most lean setting and I ended up stripping the head off of the screw trying to free it up. Is there any way to play with the mixture by raising the main jet, I’m not sure if you can raise and lower the main jet on these carbs. When going from an idle to a pin, the quad begins to die and if I stay on it the quad eventually just quits, not 100% sure but that normally points toward lean. If anyone can help me out here I would greatly appreciate it. Thanks!

95 Big Bear 350 Carb Questions

I have a 95 big bear with a mikuni carburetor and unfortunately the previous owner tightened the fuel mixture screw down to the most lean setting and I ended up stripping the head off of the screw trying to free it up. Is there any way to play with the mixture by raising the main jet, I’m not sure if you can raise and lower the main jet on these carbs. When going from an idle to a pin, the quad begins to die and if I stay on it the quad eventually just quits, not 100% sure but that normally points toward lean. If anyone can help me out here I would greatly appreciate it. Thanks!