SOHC.co.uk Forums > CB500/550

Partially Restored 74 CB550

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Laverdaroo:
Anti-clockwise  drills on a right angle chuck have always done it for me but always an awful job if your access is restricted. Just go careful and don’t thrash at it. Plus gas penetrant always works well for me also but every one needs a different approach really.

Good luck


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Oddjob:
Try some heat, seems to work with those dowels.

davidcumbria:
Success! No damage to engine case threads and no heat needed so paint preserved. The flute type extractor worked a treat after a lot of very careful drilling.

This is what I used.

https://www.amazon.co.uk/dp/B076716GZH?ref=ppx_yo2ov_dt_b_product_details&th=1

The drills are not left handed but worked well at low speed / higher pressure to cut out the Honda bolt. I also used a centre drill to aid starting off centred and lots of rocol lubricant.  No significant torque needed on the extractor I think drilling out most if the thickness of the bolt had weakened its grip.
Thanks for the positive comments. Happy days.

McCabe-Thiele (Ted):
Always good when you sort a snapped thread.

Johnny4428:
Nice work! Very satisfying.

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