A friend of mine, Charlie Wilson went from an SL 70 to a new at the time 76 Bultaco ASTRO 250 and went flattrack racing at Fredericksburg VA and other places. He said the SL 70 had the perfect geometry for a young beginner to train for flattrack. He had a lot of fun and was pretty good.
I have a 75 xl70 with the 140 motor. I am curious about your rear brake set up. I will have to modify mine. I would like to see if you need to do the same and how you modify it.
