They have changed a lot indeed since my first 60s era two stroke, oil injected Suzuki with two rear sprockets and a short length of chain (maybe 4 links) in the tool kit. You would remove those links and switch to the small rear sprocket for on road. Put them back in and go to the big rear sprocket for off road. Seems like the top speed was 38 on the big sprocket and forty something on the small one. Paid for the bike with my grass mowing earnings and a loan from my Dad. Will never forget that first biker tattoo when the skin from my forearm stuck to the hot header pipe I was trying to put back on. I watched that patch of skin stuck to that pipe turn brown and burn while I was nursing the part of my arm it used to live on. My thoughts were "burning skin stinks and I love this shit". And I still do.