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1981 CB750 DOHC. The engine was rebuilt by someone else. I am going through and setting up timing. Noticed that the 1,4 Cylinders are at the top while the timing marker is on the 2,3 cylinder. So the TDC is flipped TDC for 1,4 is set at timing mark 2,3. Cylinders 2 and 3 are at TDC when the...

Pulled apart the bottom end of the engine due to the crank chain breaking inside the motor. Crankshaft is missing a tooth on the gear. Can this be seperated and replaced or am I better off buying a whole new crank? Any suggestions on cranks if so? Used vs. New?

I am doing a complete engine rebuild for a 1981 CB750 Custom. The original motor timing chain broke. I tore the original engine down to do a rebuild and bought another for parts in case. I noticed that under the gasket on the crank case around the pistons is some tooling or dent from the...