Numbers on bolt heads?

Vranasaurus
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15 Apr 2013 21:28 #582554 by Vranasaurus

Numbers on bolt heads? was created by Vranasaurus

Can someone explain the number 7 and number 4 bolts on a Z1? Where they go etc..

Down the road I am thinking about having, or doing it myself, all my original bolts cleaned up and replated but I have no idea where they go.

1984 ZN1100

1975 Z1B

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donthaveakawman
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16 Apr 2013 01:26 #582606 by donthaveakawman

Replied by donthaveakawman on topic Numbers on bolt heads?

are they on the camshaft caps?

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Powerstroke_fan
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16 Apr 2013 08:16 #582634 by Powerstroke_fan

Replied by Powerstroke_fan on topic Numbers on bolt heads?

I believe the numbers would indicate the strength of said bolt.

1980 kz1000B4 LTD- 1327cc 9-1 comp
Ported J model head
Psp-3x cams
RS 36s
Welded MK11 crank
Back-cut MK11 trans
MTC 2 stage lock up
Stretched 4-6 over running Hayabusa rear rim with 190 rear tire
Complete frame brace kit installed
And Much Much more- SOLD

2014- ZX14R all stock for now

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lightitup
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16 Apr 2013 10:03 #582645 by lightitup

Replied by lightitup on topic Numbers on bolt heads?

the markings are for what grade bolt it is. which is based on size and strenght :evil:

81 kz 550 ltd

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Kidkawie
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I bleed premix

16 Apr 2013 12:09 - 16 Apr 2013 12:18 #582655 by Kidkawie

Replied by Kidkawie on topic Numbers on bolt heads?

99% of the bolts are zinc plated with no markings. I know 7's go on the master cylinder and clutch perch. Those are chrome plated.

I sent all the hardware out for replating for my current Z1 project. I'm using the parts diagrams for sizes.

1975 Z1 900
1994 KX250 Supermoto
2004 KX125

Last edit: 16 Apr 2013 12:18 by Kidkawie.

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steell
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16 Apr 2013 14:19 #582676 by steell

Replied by steell on topic Numbers on bolt heads?

Those numbers have nothing to do with bolt strength.

Metric bolt marking chart

KD9JUR

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Vranasaurus
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16 Apr 2013 14:47 #582684 by Vranasaurus

Replied by Vranasaurus on topic Numbers on bolt heads?

I know it can't be strength as the 550 I have has 7 marked on the bolts that hold the motor mount plates on yet my Z1 had 7 stamped on the bolts for holding the master cylinder on.

1984 ZN1100

1975 Z1B

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650ed
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16 Apr 2013 15:49 - 16 Apr 2013 15:51 #582692 by 650ed

Replied by 650ed on topic Numbers on bolt heads?

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

Last edit: 16 Apr 2013 15:51 by 650ed.

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Sorf
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16 Apr 2013 19:37 - 16 Apr 2013 19:45 #582721 by Sorf

Replied by Sorf on topic Numbers on bolt heads?

It's hard to get a definitive answer on these bolts regarding position and grade. But as above I've always heard that the number had some relevance to strength as well.....nothing to do with modern grading.
As far as position goes, you'll need someone with a dead original bike to help there.
Pretty sure the front fender uses No. 4's though?

Bit more from Z-Power
"For those who dont know the difference, if you look in the parts book, all bolts with the letter `G` in the part number are the ones with the numbers on them, normally the number 4 on 6mm bolts and 7 on the 8mm bolts. If the part number has a `B` in it then the head is just plain. If it has a `N` in it then it is chrome headed."

Classic MotorBike Forum

Last edit: 16 Apr 2013 19:45 by Sorf.

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Powerstroke_fan
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16 Apr 2013 21:04 - 16 Apr 2013 21:05 #582729 by Powerstroke_fan

Replied by Powerstroke_fan on topic Numbers on bolt heads?

I didnt know i thought they did.

Last edit: 16 Apr 2013 21:05 by Powerstroke_fan.

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Kidkawie
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17 Apr 2013 09:58 - 17 Apr 2013 09:58 #582784 by Kidkawie

Replied by Kidkawie on topic Numbers on bolt heads?

Vranasaurus wrote: I know it can't be strength as the 550 I have has 7 marked on the bolts that hold the motor mount plates on yet my Z1 had 7 stamped on the bolts for holding the master cylinder on.

I know 73 z1's had #4's in the bottom of the tool tray (and a few others), the 75's did not. I don't recall any #4 bolts on either Z1B I have. I can double check my hardware stash though.

1975 Z1 900
1994 KX250 Supermoto
2004 KX125

Last edit: 17 Apr 2013 09:58 by Kidkawie.

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Numbers on bolt heads?

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