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J.I.S.

Fuel System: Gas (Petrol) tanks, Carburators
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versuspop
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J.I.S.

Post by versuspop » Mon Apr 19, 2010 1:31 pm

Are the screws that hond the petcock on to the tank J.I.S.? CA77, BTW. Does this affect thread size, or just head size?
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LOUD MOUSE
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Re: J.I.S.

Post by LOUD MOUSE » Mon Apr 19, 2010 10:08 pm

No.
No. .............lm

versuspop wrote:Are the screws that hond the petcock on to the tank J.I.S.? CA77, BTW. Does this affect thread size, or just head size?
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versuspop
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Joined: Thu May 07, 2009 9:06 am
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Re: J.I.S.

Post by versuspop » Tue Apr 20, 2010 2:52 pm

what if it is a 65 CA77? the 6X25 (m6 X 25 with 1.00 pitch) do not fit. Nor do 5x25 with .8 pitch.

vp
LOUD MOUSE wrote:No.
No. .............lm

versuspop wrote:Are the screws that hond the petcock on to the tank J.I.S.? CA77, BTW. Does this affect thread size, or just head size?
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LOUD MOUSE
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Posts: 7818
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Re: J.I.S.

Post by LOUD MOUSE » Tue Apr 20, 2010 8:54 pm

Then could be JIS. .......lm

versuspop wrote:what if it is a 65 CA77? the 6X25 (m6 X 25 with 1.00 pitch) do not fit. Nor do 5x25 with .8 pitch.

vp
LOUD MOUSE wrote:No.
No. .............lm

versuspop wrote:Are the screws that hond the petcock on to the tank J.I.S.? CA77, BTW. Does this affect thread size, or just head size?
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jensen
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Post by jensen » Wed Apr 21, 2010 12:35 am

Hi,

JIS, on a 65 ? Are you sure that this is the original gas tank ?
I have a few gas tanks lying around, and I will look into this matter to verify. and I'll come back on this after the weekend,

Jensen
assembly of Japanese motorcycles requires great peace of mind (Pirsig)
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versuspop
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Post by versuspop » Wed Apr 21, 2010 6:08 am

That is the direction I am heading....It is possible that it is from a different bike.

"6x25mm are 6x1.0 regular screws.. same ISO and JIS.

5mm JIS screws are found on Benly 125-150s petcocks...." Bill Silver

jensen wrote:Hi,

JIS, on a 65 ? Are you sure that this is the original gas tank ?
I have a few gas tanks lying around, and I will look into this matter to verify. and I'll come back on this after the weekend,

Jensen
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brewsky
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Post by brewsky » Wed Apr 21, 2010 6:28 am

The parts book says 6x25, but that is not correct on my tank.
The 6mm threads didn't change pitch anyway...only 3, 4, 5, and 12 mm.
My guess is 5mm with old pitch, the 6mm will not even start in the holes on mine.
Last edited by brewsky on Wed Apr 21, 2010 8:08 am, edited 1 time in total.
66 dream, 78 cb750k, 02fz1, 09 wing
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