How many miles on it, when was the last service doneand how was it stored during to off season?.
Whatever "one guy" told you, it sounds like you have two separate issues:
The throttle issue sounds like a fuel or ignition issue. Could be as simple as old gas or needing new plugs.
You did not say why you thought the clutch was going, except that it was dragging when you blipped the throttle (which is an adjustment issue, not a replacement issue).
More info, please.