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At my age I still find the 80-85's lots of fun. Always nice to have one around and if you can find one cheap enough you can ride it until you find out what you really like. Lots of ways to tune one if you want to spend some fairly serious money on them. Used 4 strokes of the racing variety can become money pits pretty fast. The Yamaha 5 valver is pretty reliable for it's genre, look for one of those if you want a 4 stroke. Comes in a great trail version (wr) too.