odie

Have a problem starting the RU started about a year ago and ive tried cleaning the carbs (5times) a new CDI changed te coils and still have a problem any body got any other ideas. It will start but you have to hold the throttle open 1/3 way to get it to fire then hold hte throttle until its warm. Once warm the throttle response is rubbish until about 4000rpm then not as snappy as it once was its done 45K but been serviced regularly, Any ideas welcome...please.