Numbers on bolt heads?

  • Vranasaurus
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Numbers on bolt heads?

15 Apr 2013 21:28
#582554
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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Re: Numbers on bolt heads?

16 Apr 2013 01:26
#582606
are they on the camshaft caps?

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  • Powerstroke_fan
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Re: Numbers on bolt heads?

16 Apr 2013 08:16
#582634
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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Re: Numbers on bolt heads?

16 Apr 2013 10:03
#582645
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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Re: Numbers on bolt heads?

16 Apr 2013 12:09 - 16 Apr 2013 12:18
#582655
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.

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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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Re: Numbers on bolt heads?

16 Apr 2013 14:19
#582676
Those numbers have nothing to do with bolt strength.

Metric bolt marking chart
KD9JUR

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  • Vranasaurus
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Re: Numbers on bolt heads?

16 Apr 2013 14:47
#582684
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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Re: Numbers on bolt heads?

16 Apr 2013 15:49 - 16 Apr 2013 15:51
#582692
/
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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Re: Numbers on bolt heads?

16 Apr 2013 19:37 - 16 Apr 2013 19:45
#582721
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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Re: Numbers on bolt heads?

16 Apr 2013 21:04 - 16 Apr 2013 21:05
#582729
I didnt know i thought they did.
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
Last edit: 16 Apr 2013 21:05 by Powerstroke_fan.

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  • Kidkawie
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Re: Numbers on bolt heads?

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