My yamaha warrior motor was just completely rebuilt to stock except for it is .20 bored over and the head is ported and polished. I have a slip on exhaust a k&n airfilter and a dyno jet. At full throttle it will run and not miss a beat but when I let off the gas and take off again it will hesitate and then take off again. At half throttle when Im just cruising it will miss and sputter the whole time. Do I have the wrong jet in it came with a bunch jets in the kit for different altitudes. What do I need to do to make it stop. I also was going to change the front brake pads and the allen wrench bolt is stripped out how can I get it out since there is nothing to get ahold of.