Crankcase scoring

[mark69]

Hi, I’m rebuilding the engine on my RD250 LC, and before I put the cases back together I noticed some scoring at the very top of the upper case, it’s on the cylindrical part, just below where the sleeve in the barrel would locate, it’s not near any bearing surface. Is it ok to just clean this up? I appreciate its hard to comment without pics but I can’t post them. Thanks in advance. Mark.

[stusco]

Try Tapatalk

[midlifecrisisrd]

A pic would help but by the sounds of it you have witness marks from a rod or big end letting go

As long as nothing cracked and bearing faces are OK you should be fine

Steve