A bit more testing and even worse results. See attached. Even the fins have now got bubbles.




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This one has got me.

Acetone sounds like an idea, however I have already welded it. Have I then not already turned the oil in the head into carbon which probably wont dissolve in the acetone ?

Thanks Wallace New Zealand.

When I weld, I preheat the head and then carefully lay down a bead. If I get a pocket come up, then I heated it enough to bring it to the top. Did all that and thought I had a good surface, Once I machined it, the 100s of holes opened up. These were not there when I welded (although they must have b...

I've done quite a bit of welding over my time but this one has got me. It is a Suzuki T250 cylinder head. I wanted to reshape the squish. I welded up a the original squish band and machined it. Horrible full of holes. I then re-machined out a 2-3 mm recess around the squish, rewelded and I had a rea...