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Trumpeting Proto 2K GP9-II
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<p>I recently acquired a blue box P2K GP9-II. It wouldn't run under DC at all initially, but after helping the fly wheels turn a bit they freed up and it ran fine for 10 minutes or so. After running at break-in speeds of 20% to 40% power it started to develop a slight wine or perhaps a slight rubbing noise at 20% power or more. The wine increases with power and almost resembles the sound of a trumpeting elephant at 40% power or more. </p><p>Any ideas if something may require adjusting or possibly lubrication? Should I stop running this engine unitl I correct this for fear I may be damaging something? Or is this something that could improve after the break-in period? I don't believe it resembles the sound described in this forums threads about the gear issue. Am I wrong? Thanks in advance for any feedback.</p>
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