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oil tank 850 gen4
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  1. REV-GEN 4 - Backcountry/ Freeride
    So, I noticed last week on my 2018 850 that anytime I removed the oil reservoir cap, the rear surface of the tank would move outward. It seems like the oil tank builds a vacuum in it and is not vented. When you open the cap it pops back to normal. My buddy picked up a 2020 600R so we checked his...
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