Check the belt drive is in good condition, no split or stone damaged its a full days work to swap out. At 25k the motor will be just run in. Check the service history. The 88 twin cam motor is a very strong motor. Check the front motor mount, its under the regulator, they fail at 10-60k, its a simple fix but the new motor mount is a bit more ridgit and increases the vibration at idle.
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