Hello everyone,

I'm in need of an OS 70 SurpassII Crankcase (black valve covered head, about 1 1/2 years old) as the valve sleve area broke off during a crash. I've tried to repair it with a type of aluminum brazing stick someone here reccomended I get. It definitely worked to repair my MAC tuned pipe but the stuff just wont adhear to the material on my crancase.

Do any of you know if I purchase a "Magnum 70" crankcase if that would work with my OS 70 Parts. They look identical but I'm afraid that the tollerences could be off enough where it might not work.

Any help on finding a new or used crankcase is greatly appreciated, or if you know where I could send the crankcase to have it repaired. Tower and Hobbico no longer list them. The engine only had four flights on it.

Thanks in advance.

David.