i'm a noob and I have an sh .28 pullstart on my buggy and its giving me problems. it starts up ok but when i squeeze the throttle it cuts out. even if i try to accelerate slowly it dies on me. Also i am getting terrible runtimes. 125 cc lasts only about 1-2 min. I am only running slightly rich. I only have a quart through it. which needle adjustments should i make?

thanks in advance