SOHC.co.uk Forums > CB750

Vacuum screws

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Oddjob:
Honda have been in business far longer than 20 years AND they are Japanese so I'm sure they know what the standard JIS thread pitch is, please note what Honda said. All screws and bolts fitted to the 750 (which clearly means all bikes after as well) are to ISO standard thread pitches not JIS. So they've clearly made JIS screws and bolts with the head of the JIS standard BUT they threaded them to ISO standards not to the more normal for Japan, JIS standard. As the ISO standard for M5 is 0.8mm that means all M5 bolts and screws are 0.8 and not the JIS standard of 0.9.

So your statement was wrong, whilst correct in saying the screw is 0.8, the part about JIS standard pitch is not.

As you're so keen to point out other peoples mistakes I thought I'd point out one of yours, fairs fair.

Trigger:
So you are saying that all the M5 threads on all the SOHC's from 1969 have a pitch of 0.9  :o And i have been fitting the wrong pitch JIS bolts and screws all these years and forcing the JIS bolts and screws to damage the threads but, 0.8 screws bolts fit perfectly  :o Just tried to get a M5 with a 0.9 screw in to a head light rim for a SOHC and guess what, it doesn't fit.

And the member Pauarc has already stated that he has checked his sync port screws and his are 0.8, though the CB750K sync port screws are not the same as any other SOHC sync port screws but, only members with CB750's will know this.

Some member have experience and some members just believe what they have read  ;) 

Laverdaroo:
MASSIVE  yawn!

All very boring now, anybody want to talk motorbikes instead of who’s got the smallest Willy?

Like a pair of lasses!


Sent from my iPhone using Tapatalk

Oddjob:
I've got the smallest willy, problem solved

As for Graham.

Do you really not read what's been posted? or are you being deliberately obtuse?

Whenever it's shown you're wrong you start throwing toys out of the pram and invent stuff to support your failed arguments. You got it wrong, just admit it and move on. I do.

McCabe-Thiele (Ted):
This JIS pitch conversation is weird, it appears that Paurec says the pitch is 0.8 he has checked with a gauge & posted a chart, Graham has sold millions states the pitch is 0.8, Ken says they are 0.8.

So what was the point of trying to get a M5 0.9 pitch screw in a headlight rim to prove its 0.8 I'm lost in semantics here.

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