Odd screw threads on these old hondas

salukispeed · Post by **salukispeed** » Fri Aug 07, 2015 11:15 am

I have been working on my 66 CA77 and just remembered that some of the thread pitches are not standard for today bikes. Seems line 3-4and 5 MM screws are the main oddballs. Does someone have good sources for these. I am not sure if JIS or ISO or something else is correct but the point plate is an example of odd ones. This bike is original and has not been hacked with English/inch yet.and I want to keep it that way.

Eljeef · Post by **Eljeef** » Fri Aug 07, 2015 7:39 pm

Welcome. It would serve you well to do a little searching on this forum...just a little.

G-Man · Post by **G-Man** » Sat Aug 08, 2015 12:59 am

Searching on this site is a bit of an acquired skill. Nowadays I just do a google search and include the term "honda305". That usually finds stuff on here a lot quicker than the built in search facility..... :-)

thread size and pitch

newISO - oldJIS
3mm- .5 - .6
4mm- .7 - .75
5mm- .8 - .9
6mm- 1.0 - 1.0
8mm- 1.25 - 1.0
10mm- 1.5 - 1.25
12mm- 1.75 - 1.5

I wish we had these guys in UK.....

http://www.mcmaster.com/#machine-screws/=yegk2d

G

salukispeed wrote:I have been working on my 66 CA77 and just remembered that some of the thread pitches are not standard for today bikes. Seems line 3-4and 5 MM screws are the main oddballs. Does someone have good sources for these. I am not sure if JIS or ISO or something else is correct but the point plate is an example of odd ones. This bike is original and has not been hacked with English/inch yet.and I want to keep it that way.

brewsky · Post by **brewsky** » Sat Aug 08, 2015 5:58 am

G-Man wrote:Searching on this site is a bit of an acquired skill. Nowadays I just do a google search and include the term "honda305". That usually finds stuff on here a lot quicker tahn th ebuilt in search facility..... :-)

thread size and pitch

newISO - oldJIS
3mm- .5 - .6
4mm- .7 - .75
5mm- .8 - .9
6mm- 1.0 - 1.0
8mm- 1.25 - 1.0
10mm- 1.5 - 1.25
12mm- 1.75 - 1.5

I wish we had these guys in UK.....

http://www.mcmaster.com/#machine-screws/=yegk2d

G

salukispeed wrote:I have been working on my 66 CA77 and just remembered that some of the thread pitches are not standard for today bikes. Seems line 3-4and 5 MM screws are the main oddballs. Does someone have good sources for these. I am not sure if JIS or ISO or something else is correct but the point plate is an example of odd ones. This bike is original and has not been hacked with English/inch yet.and I want to keep it that way.

G,
I only remember the 3, 4, 5 & 12mm sizes changing pitch?

cknight · Post by **cknight** » Sat Aug 08, 2015 9:29 am

The CB72/77 (and maybe CL?) headlight bucket bolts are 10mm JIS. Also, the four 12mm rear engine mounting bolts are JIS. Please correct me if they changed in the later years. Regards, Chase

Steverino · Post by **Steverino** » Sat Aug 08, 2015 12:36 pm

Salukispeed I don't have much success either using the forum search I do as G does with much better results. So you are not the only one.

brewsky · Post by **brewsky** » Sun Aug 09, 2015 7:04 am

Here's a link to a site with the service bulliten tl27, change of threads, dated june 1967.

I have a copy in PDF but it won't attach to this board.

http://www.drooartz.com/index.php?page=58

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Odd screw threads on these old hondas

Odd screw threads on these old hondas

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Re: Odd screw threads on these old hondas