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2012 Yamaha vx cruiser with loss of about 8-10 mph from top end, humming noise coming from engine, intermittent vibration like something is stuck in impeller. I removed the impeller completely and ran the engine, still get same humming noise and intermittent vibration from engine, spark plugs and compression to all cylinders good (175-180 psi), transfer case bearings are smooth and tight. I found that the silencer in the exhaust tube is blown out and the transfer drive gear has a bit of play in it (would this cause my symptoms, no signs of any metal filings in the transfer case or bottom of crankcase) Not sure where to go from here.
 
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