Ronald Walters | Eachine ET5 - Doing A Valve Job @RonaldWalters2010 | Uploaded April 2021 | Updated October 2024, 1 hour ago.
Lapping the valve seats in the Eachine ET5 (same as M12) to clean them up a bit better. Same approach could be used for any of the Hit & Miss engines.

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M12 Mini Gasoline Engine detailed review and demonstration.

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