Hi, I've got a california model '01 xr4. I just installed a xrs' only pumper carb, 14 tooth front sprocket, an white bros pro meg pipe. K&N filter an removed the snorkel. Xrs' sent me the carb with a 130 main and 17.5 pilot. My bike maybe has 15 hours on it. It pulls like crazy until I peg the throttle, then sputters. Am I hitting the rev limiter or do I have another problem? I checked the valves and they are fine.