sled will idle fine. when trying ot ride it is real boggy then comes outa it and will pull hard again. rite now in my carbs i have the stock 470's and the clip on my needle is one the 4clip down thats where it was stock. and plugs seem to be buring the same and look ok. but one thing with the plugs one side seems to have more carbon or what not built up on it then the other. when i put brand new plugs in one was still pretty clean around the edge when took it out to do plug check.