So my powerband is a little funky. I'll start my bike up and it kicks right over. We'll while riding it, it won't hit powerband till 3rd gear. At this point ill get out of first and second as soon as I get in. When I warm it up and rip around the problem goes away. And I'll get powerband back in my first and second gear. What could be the cause of this? Could a mucked up power valve be the culprit?