the 670 is very able lots of power have your r.a.v.e valves cleaned every 500to 700 miles use synthetic oil so the r.a.v.es stay cleaner.Hang on tight if its working good it will run with any 700 on the snow!
If you're looking for a great riding powerful touring sled the Z670 was a good sled. If your looking for a ditch banging rocket...keep looking. The AD Bouvin designed rear suspension was good and smooth at slower speeds but was never meant to be ridden aggresively.
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