So I bought a Bicycle Motor Works Knight Rider kit fully assembled on Craigslist. First, when rolling (even engine off) it makes a loud "RRRRR" noise and it gets louder the faster I go. It's really loud and distracting. Second, the bike rides really rough and will not idle at all. It's either on or off and the engine rides really rough. Those seem to be the main issues I am having with it. I don't know what to do or how to fix or even what's wrong. Any help would be appreciated. I think the idle screw needs to be adjusted but I have no idea about the rear wheel making that god awful noise.