Heat cycles have been done by my mechanic and he also retightened after break-in.
I will purchase a leak down tester this week and let you guys know the results.
I apologise for sounding harsh in my previous posts, that is my nature, sometimes it becomes my undoing.
Did your mech also advise you to ride at no more than 3/4 throttle for a couple of thanks of gas.
If your mechanic knew his stuff, he would have looked for the cause of the problem which blew your previous motor and then re jetted to correct the problem.