When I was 15, I moved straight off an 85 to a 250f, and it was proabably a full season untill I was getting the best out of the bike, had the 250f for 2 years, but sold it to get my rm250 in january, I think having the 4 stroke made me appreciate coming back to 2 strokes more than if I never had the 250f, I think I would keep thinking about how good a 4 stroke might be had I not owned it, but I think i learnt to ride on the 85s like most people do on 125s, me and my dad made the bike as snappy and revvy as possible and I had to ride it hard to make it go, was loads of fun screaming that 85. There are still loads of kids getting off an 85 and onto a 125 in england, but then there are the ones getting off a 65 and onto a handa 150f...