I've already 16000 mile on the AN650. After about 4-5000 mile, each time I start the engine there's a noise coming up as if the belt is sliding on the poly or so. Is it a common "disease"? And there's another noise coming from (I guess) the fuel pump or so (It’s sound like a whistle. When the engine is working, or not. For a few seconds). Again, anyone encounter that noise?