Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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I would check the carb as this sounds like the carb is partially clogged in a high speed jet which would not let blades engage or run properly. most of the time these carbs are pretty cheap (UNDER $30) so we at shop buy new one and install instead of clean and rebuild. You can try putting carb cleaner in carb and trying to blow it out with the cleaner, but normally has to be pulled