your 2009 does NOT have a curb idle/tps adjustment screw behind the factory left side scoop. last year for that arrangement is 2007 XB's all models. your cold and hot curb idle speed is adjusted by the ecm via the IAC assembly which is part of the throttle body full assembly. in other words it is automatically adjusted by bikes' computer. what causes your situation: believe it or not either a faulty neutral indicator switch or a faulty clutch lever safety interlock switch....or both. a faulty IAC rarely acts like that. i'll also add that the IAC is now listed NLA which is bad news for XB owners. good news is that i still have new ones in stock.