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A. J. Clark

Have you checked cooling air flow. Sounds like over heating. Is it a new engine? What propeller are you using? It's common for people wanting to put larger props on planes in the hops to get more performance.

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It is new engine. Using right propeller. It is company tuned engine. But unboxing this engine after more than 8 month's.
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Yes

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Yes. It was working new company tuned engine with propeller . It fail during flight.
Only concern thing is that engine was open to air for display and was previously in store for more than 8 months.
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kmeyers

How?
Do you have telemetry?
Is your fuel premix or oil inject?
You are providing little info.