Salam ! MM is not the kind of vehicle which the present day mechanic could handle. Ustad Liaquat at Tehmasap Abad, Rawalpindi, is the best known MM mechanic. He is expert, efficient and honest. Some of the most well kept MMS are running courtesy his workmanship. He has a treasure of Morris spares and he knows how more could be sourced. The best thing is that he loves working on MM. But he is a very self respecting person and you have to very gently interact with him. You may reach him on his cell number 0333 5118344.
Good luck