We went down to Cumberland Marine yesterday traded in our 04 G3 bass boat with a 90 horse Yamaha on it and came home with a 19.8 foot 2008 hurricane fundeck boat with a 115 E-Tec Evinrude. Never having owned a direct inject fuel system I quickly learned it has a air pump to operate the injection system. It sounded to me like a rod tapping until I was thoroughly walked through how the motor operates and what to expect. Their Master Mechanic assured me this motor for an 08 is a very sound motor. He pointed out at the through the Hub exhaust that the area was black from the exhaust. He said when they did a compression check the plugs will need changed but the compression was average for the specifications given. You guys have been very helpful for me during my time with a Yamaha outboard engine but I think I'll have to go join a Evinrude Forum now