I have began working the cases, they have been extensivly welded to repair possibly more than one major failure.
The welding looks very good.
The welding distorted the cases so they had to be faced true perpindicular to each case half removing a total of ,024"total off both case halves, sgeezing the crancase together .024" making it nessesary to open the cases cylinder holes so the protruding sleeve on the bottom of the cylinder will slide into the assembled cases. And relieving the inside right crankase half the same, for crank clearance
One case half was clamped down on the jigborer table, the main bearing was zeroed in, the the other case half was set on top and its dowl pins and most of the bolts installed. Then, that cases main bearing was zeroed. The offset is pulled up on the DRO. The cases were misaligned .014 in one direction and .003 in another. So I zeroed in the dowl pin locations and moved them over to compensate the mainbearing missalignment.The dowl pins are 1/4", so after moving to the corrected position, I sunk a 5/16 endmill into the case and then made 2 dowl pins both with 1/4" and 5/16" ends.
This brought the main bearings within .001" alignmet making it then possible to line lap the cases right main roller bearing bore true.
The cylinder mounting surfaces on top of the case halves are distorted and will be faced and trued to the center line of the crankshaft.
The tranmission area being part of the engine cases wil have to be delt with using much of the same.
I will have some photo links soon of the Moore jig borer. Putting life back into a vintage motorcycle engine.