SOHC.co.uk Forums > CB350/400

400/4 cyl.head

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kenny1059:
Hi,
Could someone please tell me if the holes marked in blue in pic,can be helicoiled o.k.  They seem very close to camshaft bearing.
cheers, Kenny.

PatM:
Ken by, I've never used helicoils as I don't trust them. If that was mine, I'd tap the holes with a blind tap, next size up. They are very close to the wall, as you say. You start a blind tap with a taper tap, the once the first few threads are cut, swap over. A blind tap has a flat top, rather than a point, if you follow.

Bryanj:
They can be helicoiled with care, the next normal size up is 8mm which may be too big, i believe helicoils are 7 to 7.5 mm OD

Clem2112:
Yes.
Had a few of mine done including that dodgy looking thin walled one !
It looks like Honda made a small mistake with the casting designs.

I use a local engine machining specialist who charge a couple of quid per repaired hole.
In time all these will try to strip if the cover comes off enough times.

Trigger:
Your not wrong on that Oddjob. That head is showing a lot of overheating marks and oil starvation, what is the cam shaft like???

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