(1999 yz400)Hi there, my bike is running fine it seems but to start it I have to turn the idle way up or it won't start it sounds like it wants to start but won't idle, once i turn the idle way up it will start fine but then in 1 sec it revs right up as the idle is turn up high. Then I turn it back down to normal idle. I just putted up and down my street seems to be running fine but really havn't fully check it out I brought it back into the backyard after that........i tested starting it but still had to turn the idle back up to get to start and idle........ what are the reasons its doing this? only mods to carb was boyeenseed quick shot, power now. I belive before I installed the carb back in i adjusted my fuel screw to 1 and 3/4 turns out. any suggestions to whats going on?