SOHC.co.uk Forums > CB750

Knock pin.

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Johnny4428:
Julie, I have measured again and my pins are not far off the same size as yours which are too long. I have measured the recesses and I wouldn’t put anything greater than 20mm for fear of either poor seal or worse a warped head. I had a root about in old 750 parts that I removed and found a pin 18mm in length, I would say that is the same as the old one that I didn’t manage to remove. I’m not sure why this should be, even if the head has been machined it’s not going to be mm off it it’s going to be thousands. Any ideas?

ka-ja:
Called "dowels" in engineering and not necessarily hollow tubes.

Johnny4428:
Yes well that’s what I would call them if I hadn’t studied the parts list. I reckon I’ve got a cylinder head off a newer model that uses 18mm dowels/“knock pins” 🤣

Nurse Julie:

--- Quote from: Johnny4428 on July 28, 2021, 07:21:26 PM ---Yes well that’s what I would call them if I hadn’t studied the parts list. I reckon I’ve got a cylinder head off a newer model that uses 18mm dowels/“knock pins” 🤣

--- End quote ---
Give us a few minutes Johnny, I've got Graham on the case having a measure up.

Nurse Julie:
Grahams had a measure and you need 12 x 18mm (the dowels actually measure a tad under 18mm)

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