So i have a 2001 yz 426 the bike seems to run fine unless you get on it after being in mid range power. It will start to bog or miss im not really sure, unless i clutch it to bring the rpm's up before getting on it. Im lockated at 3200 feet and i bought the bike from a guy that is located around 7000 feet. Could that be the problem? It was recently built with a big bore kit and 13.5.1 compression. about 5 hours ago could it not be broke in yet? Thanks.