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    Help A Noob!!! Compression Test Question for a Yamaha xl1200

    I have a question about the Yamaha XL 1200. Does this model have a power valve? Why do I need to hold the throttle wide open? Do the remaining spark plugs need to be tighten down or can they be loose fitting? I ran a compression test and the readings are extremley low but the ski runs . Only has 58 hours on it. How do I disconnect the power valve servo?

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