Why do cylinders occasionally have porosity in the bore?

This is a common question we receive, and the best answer is that it is formed in the cylinder during the casting process. Unfortunately, there are a lot of misconceptions about porosity. Some customers are worried that that a ring will catch on it or that it will...

I had a rod break on my vintage racer and it went through the back of the bore. It looks like it’s scrap to me, but I can’t get a replacement from anywhere. I’m desperate – can you help me preserve my bike?

Probably! We pride ourselves on the quality of our welding and machining of damaged bores, and if you have seen our literature before you will probably already know what we are capable of. Sometimes (rarely) we come across situations where we do not feel confident...