Hi, I just bought the blue CBR250RR from the user selling it on the forums, I have noticed two things that concerned me. 1) I dont think my choke leaver does anything. I dont notice any difference? 2) I have noticed that my exhaust is smoky. ie. you can actaully see the air that is coming from the exhaust, when normally on other bikes/car its clear? Any ideas on what could be wrong? Thanks.