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John:

Your problem still sounds more of an issue with fuel delivery/flow rather than one of heat.  It could be as simple as a leak in the upper deck pressure lines, to a sticking aneroid in the fuel pump.  Too detailed to discuss here, call me in the evening and I'll discuss how to check it out.

"From the top of my soap box":  I suggest to all TSIO owners to get off the dime, and get the fuel system set up professionally and keep it that way annually or every 100 hrs. per the TCM "Top Care" instructions.  To expect this engine to perform at peak capability without providing the correct fuel flow/ timing, and go to TBO is stuff straight out of FantasyLand.  Mike

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Please send your photos and drawings to marvkaye@olsusa.com.