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Ktm exc 125 would be an excellent choice and you should have no problem going 2 years before doing a top end rebuuild. And 50 mph is not taxing on a bike geared for 90 mph....if you look at Hondas repair manual my credit should be rebuilt after 7 hours. ...but I rebuild it or any other 2 stroke I use a lot after 2 years just as a precaution.
