SOHC.co.uk Forums > CB500/550

Question to people who have vapor honed their engine

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Sesman:
Bung the oil ways. I’d used Hilltops silicone bungs to good effect.

Blast the outsides only.

Dry thoughly and blast out with high pressure air line.

Wash and wash again.

Dry and blast with airline.

If in doubt, wash, dry and airline blast again .

Use pipe cleaners and small bottle brushes to clear the oilways.

Clean out all the threads. I used 6mm and 8 mm taps. Make sure you clear all debris from the bottom of the thread hole.

Oddjob:
Or fit old bolts into the bolt holes first.

royhall:

--- Quote from: Oddjob on March 15, 2022, 06:39:41 AM ---Or fit old bolts into the bolt holes first.

--- End quote ---
Ditto on this one, better to keep things out than try to remove them. This is especially important when powder coating. Also as an experienced toolmaker I cringe at people cleaning threads with taps. Taps are very sharp and hard and if started wrongly due to debris they will recut the thread again ruining the component. Threads should be cleaned with a new bolt with two flutes ground into it. A bolt is soft and will not damage the original thread but does take more time and effort than taps.

Sesman:
Retapping clean holes worked just fine for me and has done for 45 years. The hole needs to be clean. I wouldn’t use a tap in all circumstances.

alexdecker:
Ok, shot some pictures of the engine and marked all the oil passages I could find.

To me, it seems that all the passageways are through-holes, with the exception of the oil channel under the cam journals. So I will take extra care in covering that up. But the others, I can technically get some pipe cleaners and brushes through, right?

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