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Yes, if the balance shafts are not correctly timed you can have some ugly vibrations. When I got my 924S, they were off; didn't know till I went in and replaced the belts. I re-zeroed the balance shafts, and was completely blown away by how much smoother the engine ran! Not just idle, but at the higher speeds too.
You might try re-timing the balance shafts only; that's what I'd recommend.
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Vaughan Scott
http://www.vaughanscott.com
http://www.924.org
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