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I have a 98 & 99 Formula Z 670 and both have 6000 miles on them and I have not had any problems with them. They are pretty rough on the trail if there not groomed but other than that they are a very dependable sled.The 99 rides alot better than the 98 do to the new ski style. They start so easy I would not waste your money on electric start but reverse would be nice!
You can purchase Bovion springs that will help the ride.
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