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Talk about engine building here. New products, tricky questions or showcase your work - If it's engine building related it's welcome here.
Hi
I am rebuilding a VW 1200cc air-cooled engine. I have found vertical scratches on tow of the pistons. On one off the pistons I have tow scratches that I can feel with my finger nail.
Do I need to replace the pistons?
Depends on how hard you push it. And how bad they are.