my 500 seemed to lose all it's giddy-up so me and a friend pulled the driven clutch and the buttons have some noticeable wear,but they are not chewed up and mangled like i thought they would be,i'm waiting for my new buttons to show up and hope that is the fix. the thing idles perfect,nothing abnormal except extremely sluggish response to throttle. any ideas welcome. it has a clean\ new air filter and new plug and fresh gas . pretty sure it's the buttons..