Just want to thank in advance for the wealth of knowlege I have been able to review sincerely appreciate the advice.
Well sons mini-racer (Kasea 90 AC) blew a hole piston and in need of top end/ possible bottom end rebuild (I assume). We only use it at the dunes and not for racing. The cases are fine and it is an "Air Cooled". He was riding and the bike just stopped. and when I wen tot kickstart it, the kickstart locked. So I open the case and was able to free it. So when I spin the crank it only spins until it locks up then I can turn it in the opposite direction until once I again it locks up. Its almost like something is jamming the crank. I plan on removing the cylinder and hopefully see exactly what is wroing.
My ? is should plan on doing both the bottom and top end? Is there a way I can avoid the bottom end? We dont race just dune ride?
Thank and will post tommorow once I find out what could be the problem.