Vacuum screws

[Laverdaroo]

Ffs!🥱


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[McCabe-Thiele (Ted)]

Yes Roo. 🏳️🏳️🏳️🥱

[AshimotoK0]

I always use this Service Bulletin as a reference for  threads Honda used pre and post 1967, as I have early 60's bikes and post '67 ones too.

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[Oddjob]

Does anyone know what size the vacuum screw on carb on cb750k are  like to change them they are a bit damaged

M5 with a 5mm thread 

Not entirely correct that….

Surely if it’s an M5 bolt, it’s telling you it’s 5mm, the pitch of the thread is what your after in that question in which case it’s only one of two options .08 or .09, that’s all it can be. Not in the workshop so can’t check but if you have a tap and Dye set use your thread gauge and find the matching pitch in that particular screw. Simples




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 I would like to remind that only one option for the SOHC bikes which this thread was about and to say that it is one of two options is incorrect 

No, that's not what you said.

You clearly stated that the standard JIS thread was 0.8, not the modified standard thread, which is 0.8. There are STILL 2 JIS standards, the old and the new, the fact it's a 750 we are talking about is irrelevant. It's very interesting that Honda did take the trouble to clarify the situation even 2 years after changing.

As for the Honda college, you are really trying to say they were discussing JIS over 10 years after changing the standard? Plus back then you'd have needed to be fluent in Japanese to attend and that's a language notoriously difficult to master never mind talking technical Japanese.

[Trigger]

The Question was about a sync port screw / vacuum screw so how can that be irrelevant. The member asked a question and i answered it.
Roo contradicted my answer with the wrong information about a M5 pitch screw for a 750 and any other SOHC's.
Ken jumped on the band wagon with his little team to confuse the thread and the correct answer. 


They spoke very good English in 1992 in Japan as they do today. And yes they teach you a lot about JIS in the engineering collage and do teach you about changes in Honda parts and engineering practices 

[Laverdaroo]

No I didn’t read it again ffs, get over yerself Graham


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[McCabe-Thiele (Ted)]

Come on Ken & Graham stop using this forum like a Gladiator Stadium for supreme Honda knowledge.
We are aware that many members here have vast experience on old Hondas without all this theoretical bickering over a thread pitch.
If I want 500 advice my first port of call  in reverse alphabetical order is is Ken or Bryan.
If I had a 750 it would be Graham.
Lots of folks here know about the 400's.

Time for a truce eh lads or just agree to disagree.
Members make their own choices about whose advice to take.

[Matt_Harrington]

Well said Ted!

[oldchuffer]

Yeah well said Ted!  The constant bickering is ruining a good forum.

[Oddjob]

I would Ted, would love to. However it takes 2 and one of us isn't playing.

[SteveD CB500K0]

Bored with this.

Any more and I’ll delete the whole thread.


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[Oddjob]

Fair point Steve.

Personally I'd say delete the thread. No knowledge will be lost and the back and too doesn't make the forum look good. Maybe for the best to put this to bed.

[Laverdaroo]

Get rid, I would!


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[McCabe-Thiele (Ted)]

I agree.👍

[Trigger]

I always use this Service Bulletin as a reference for  threads Honda used pre and post 1967, as I have early 60's bikes and post '67 ones too.

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Cheers for posting it Ash, i could not find it yesterday mate