SOHC.co.uk Forums > CB750

Vacuum screws

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Laverdaroo:
Loz did say that Ken


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Laverdaroo:
Don’t be Ted, just yawn, tut and roll your eyes like the rest of us!


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Laverdaroo:
Nearly forgot……….


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Trigger:
I know I am not wrong. I went to Honda technical collage in Japan, where I was taught that the JIS bolts and screw thread changed in 1966 to 1967.
The question was about a CB750 and the 750 was not made in !966/67  ;)

Oddjob:
Paul posted a picture of a Honda bulletin which says that motorcycles like the CB750 were fitted with what are essentially a mixture of both ISO and JIS standards Ted. In order to try and avoid stripping threads Honda decided to keep the look of the JIS screw and bolt BUT they threaded them to the ISO standard and not the JIS standard. The JIS standard for an M5 screw or bolt is 0.9mm, whereas the ISO standard is 0.8mm.

Graham in his usual, I know everything manner, incorrectly said the JIS standard is 0.8mm and the Honda bulletin clearly shows he's wrong. Now for some reason he can't read bulletins any longer and when he does he clearly misreads them, or as is more likely, he pretends to misread them and continues to argue a losing point.

So to clarify, all bolts and screws fitted to bikes like the 750 are threaded to ISO standards not JIS standards, the shape of the head is irrelevant, as it's the thread pitch that counts not what it looks like.

Roo,  ;)

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