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Goose1963

2006 YFM25BV service manual

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So I got this ATV for free. The owner said it made a noise  when it was being started. So he was putting new valves in it. He also mentioned something about a shear pin on the gear for the timing chain?.. So before I start to reassemble this jigsaw puzzle any other possible checks I can make so I don’t have to tear this back down. Any thoughts or ideas would be great. Thanks in advance

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