ANSWERS: 2
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engine not balanced good.
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Four cylinder engines can't be balanced, perfectly, throughout their rpm range. There is always a spot where the engine will vibrate. The manufacturer balances the engine so that this vibration spot is in an area that normally isn't used a lot by the average consumer. The exception to this rule is a counter-balancing, counter-rotating shaft that neutralizes the vibrational effects of the four cylinder crankshaft. If your engine has this type of set-up, you should contact your local motorcycle shop. Otherwise, it is a normal condition that you can alter, but not eliminate.
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