That is a 8 percent gain in air flow so it shouldn't be that crazy I would check my float and make sure it is full of fuel. If it is slow filling it can lean out and it will rev like that pull the bowel and check flow by hooking ip fuel and move the float check the flow if that is good pull the main jet out re assemble and start. If it falls on its face when you give it gas then the jet is way off if it revs the tube that holds the jet is blocked