crankshaft issue?

Finally starting to put my 305 back together again and noticed this damage on the crankshaft under the right cylinder. Its more than superficial, I can easily feel that metal has been removed.

Is this a big problem? Hope not, coz I'm one big problem away from abandoning all hope for this bike.  And what caused it? Shavings from the damaged piston I replaced 2 years ago, or something else?





 

Nothing wrong with that.
Crank webs are cast steel then machined smooth for balancing etc.
That is a trough in the casting that was too deep to removed when it was machined.
 

zed1015 wrote:

Nothing wrong with that.
Crank webs are cast steel then machined smooth for balancing etc.
That is a trough in the casting that was too deep to removed when it was machined.

 

Phew! I like problems that aren't problems.

no issue run it

I'm surprised that the crank is cast.  I thought the pieces were forged.