Most of us had to remove a couple of links from the chain to make it fit. They send a little extra usually so you have enough. If that is the case and the chain won't get tight you need to just remove a couple of links then reinstall the master link.

When you install the master link make sure the clip is facing toward you not toward the r motor. If you need to remove chain there are a couple of threads to explain it. If you can't figure it out ask and someone will explain.

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