So I've noticed in the past how my bro's yz250 doesn't hit like my yz250. His bike is pretty much all stock with the exception of an FMF exhaust. On all the yz250's ive rode the powerbands hit alot more violent so to say. I can hear the powerband go on but the bike just doesn't pull hard (but it still accelerates). When I take off from first, i can hear the powerband turn on like a light switch but the front end does not shoot up like I would expect m bike to. Mainly 1st-3rd do this, fourth and first feel like they pull just fine. The bike has tons of compression still. Any idea guys what you think this can be? Any info would be appreciated, I hope its not an expensive fix.