SOHC.co.uk Forums > CB500/550

help ! ..sheared cylinder head bolts

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Jimbo550:
Might be worth checking if they are stainless? That may cause you extra problems.

Ewan 500 K1:
fine on the stainless front jimbo, they're just the usual steel jobs

K2-K6:
As the others have said, it's difficult to get the out with an extractor after drilling them.

Assuming that you get the hole as big as possible, then the tapered stud extractors try to push the remaining bolt material outwards to give even more grip which is not what you want.

If the bolt has snapped because the threads are siezed into the head then it will most likely snap any extractor that you put into it as it's an even smaller dia with the tools usually brittle. When it's like this, then Pete's advice is probably the best route to success.

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