Exactly. It acts as an insulator so chain vibration on the slider doesn't get amplified by the swingarm. Do make sure your sprocket alignment and chain tension is correct. You should have only slight chain play when the suspension is compressed to the maximum tension point. This is when the swingarm pivot, front sprocket centerline and rear sprocket centerline are exactly aligned.
On some bikes it's easy to remove the shock for checking. Other guys use a strap to compress the rear suspension. The fastest way is to have two heavy friends compress the suspension while you check the chain.
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2011 EC250E
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