First let me say I am new to this forum and new to ATV's. I bought my grandson a 2004 predator 90. Being as he is a beginner I put a jumper on the CDI like the book said to slow it down until he gets use to it. I was wondering about this, does the jumper act as a rev limiter? When I hit full throttle it starts popping. It didn't do this without the jumper. I am sure I will have more questions later. Thanks in advance for any help you can give me.