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A while ago I found someone's discarded four-stroke 25cc string trimmer, and it wouldn't run properly. I opened up the engine and found that the camshafts were made of plastic, and the exhaust cam lobe, likely from heat, had been worn down as smooth and round as the camshaft itself. So it wouldn't lift the exhaust valve. I tried hard to find parts but the only "repair" option is an entire engine. 
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Jul 8, 2019 11:41
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| # ¿ May 12, 2024 11:22 |
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