over the last few times i have started the machine of which it has set about a week at a time in between but i have noticed a whine but not exactly, like metal on metal lightly. It almost sounds like bearing goin out but this machine only has about 230 hours on it. It is most noticable at idle (with the blades off right after first starting up) i think because the engine is quieter but at full throttle i can hear it also. It seens to be coming from the back of the machine making me think it is something in the clutch. After i start the blades and let them run for 10 seconds or so and shut them down i hear the noise slightly as the blades slow down and the frequency decreases with blade speed yet again making me think it is in the clutch. After the blades have been on though i do not hear the noise with just the machine running. Just wondering what everyone thinks befor i take it in to the shop and it is something simple.