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TOPIC: 27 mm socket? kz900 front sprocket nut????

27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #590534

  • trianglelaguna
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got a new chain and sprockets for my 900...i know i don't have the right size socket anymore....gonna buy one....27mm right? 1/2 inch drive i do have and torque wrench...just need the right socket

1976 KZ900 A4 38 years and counting
Last Edit: 1 year 5 months ago by KZCSI.
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27 mm socket? kz900 front sporket nut???? 1 year 5 months ago #590546

  • 821000ltd
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That is the one you need. I got one in the top of my tool box that I used once.
If shipping wasn't so much I would just send it.
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27 mm socket? kz900 front sporket nut???? 1 year 5 months ago #590590

  • trianglelaguna
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thanks...no worries but nice thought...i need to buy one anyway...less than pizza....thanks for the reply...ordering now
1976 KZ900 A4 38 years and counting
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27 mm socket? kz900 front sproket nut???? 1 year 5 months ago #591353

  • trianglelaguna
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DSCN0020.JPG

no...no...no...the front sprocket nut on a kz 900 is 1 1/4" by7 my tape...

NOT NOT NOT 27mm....which is btw 1.06299 inches


ordered one 27 mm..went to work on the bike.wrong!!!!!
1976 KZ900 A4 38 years and counting
Last Edit: 1 year 5 months ago by trianglelaguna.
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27 mm socket? kz900 front sproket nut???? 1 year 5 months ago #591381

  • racer54
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Since when did the japanese start using standard size hardware?
1980 LTD (changed over the years), 1979 LTD (being rebuilt), 1977 KZ turbo and various KZ's in various states of build. KLX110
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27 mm socket? kz900 front sproket nut???? 1 year 5 months ago #591382

  • trianglelaguna
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i just used my tape to measure...i remember my neighbor had a big socket box for heavy equipment and he had loaned me a 1" and something socket for my MKII ...but it was few years ago so posted this thread before buying a socket online...1 1/4 is 35mm ???

Millimeters to inches

1 1/8"
30 mm
1 1/6"
32 mm
1 1/4"
35 mm
1976 KZ900 A4 38 years and counting
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27 mm socket? kz900 front sproket nut???? 1 year 5 months ago #591383

  • trianglelaguna
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anyone here know waht size socket for the nut in question
1976 KZ900 A4 38 years and counting
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27 mm socket? kz900 front sproket nut???? 1 year 5 months ago #591404

  • bluej58
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I just checked the nut on my spare KZ900 output shaft and it is indeed a 27mm, and so is the one on our 78 KZ650 engine.

That nut of yours looks nasty.

JD
78 KZ1000 A2A
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27 mm socket? kz900 front sproket nut???? 1 year 5 months ago #591405

  • bluej58
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78 KZ1000 A2A
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591416

  • trianglelaguna
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thanks for the link I may just order the new nut and washer monday...thank you
1976 KZ900 A4 38 years and counting
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591435

  • steell
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1" = 25.4mm
1 1/6" = 27mm
1 1/8" = 28.5mm
1 1/4" = 31.5mm

1mm = .040" roughly, good for mental calculations

1/16" = .0625"
1/8" = .125"
1/4" = .250"

1" = 25.4mm because Congress passed a law making it so :)
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591457

  • Patton
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Edited to conform with Jeff Saunders' post hereafter: 27mm is across the hex. 20mm is the thread.
The later KZ's came with a 30mm head on the nut. Both are 20mm thread.


20mm is the shaft thread size = internal thread size of the nut.

The socket size to fit the nut is measured as distance between the flats, same as an open end wrench.

1¼" between the flats would be about 31.75 millimeters.

Depends, of course, on accuracy of the measurement between flats.
Measuring in millimeters (with a caliper) would be the better choice for determining metric socket size.

Important to use the correct snuggest fitting socket, due to the sometimes extreme force required to loosen the nut.

If the 1¼" inch socket fits without undue slop, it may work okay, but could try a 1 3/16" socket -- which equates to 1.1875" or 30.1625mm -- on a 30mm nut.


Good Fortune! :)
Last Edit: 1 year 5 months ago by Patton.
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591462

  • Dr. Gamma
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I just went out to my Kz parts collection, and found a bag of 92016-043 nuts in the drawer marked KZ sprocket nuts.

That nut has a 30mm outside size, and a 20mm inner thread size.

I remember right, the early Z1's having a smaller outside diameter nut than like the Z1B's, and the Kz900's did. Maybe that was a 27mm nut size.

Now that nut is for the output shaft where the splines don't go all the way through the countersprocket. The MK II motors had a output shaft where the splines went all the way through the countersprocket. Those shafts used a different nut and lock tab.
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Last Edit: 1 year 5 months ago by Dr. Gamma.
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591485

  • bluej58
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If you are going with an after market sprocket and I am pretty sure you are , make sure that the lock washer you are going to use has a tab that lines up with the hole in you new sprocket.

I had to go with a newer version lock washer with a spline because the hole was in a different place than the stock sprocket :pinch:
78 KZ1000 A2A
Last Edit: 1 year 5 months ago by bluej58.
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591497

  • trianglelaguna
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all good info...i am call tuesday when the shop is open...they should have a tab/lock/washer and nut....who knows what the p.o used and i never checked it before ...went through two chains and figured i'd wait on a lot of stuff till i was ready to re-do this bike....

i will get the right stuff....i have seen a few different answers here...or am i messed up...

glad folks can take the time to help though...i used a big standard socket like i said on the MKII and i remember that the size was familiar to me as matching my spud wrneches when i was an iron worker for years...years ago...1 1/4 was a spud...but some were 1/18 so i can not recall now

my tape said 1 1/4 inches across the flats of the nut and i measure stuff all day at work...so 1 1/4 this nut is for sure....100%

DSCN0020_2013-06-09.JPG
1976 KZ900 A4 38 years and counting
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591635

  • bluej58
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:)

outdrivenut.jpg
78 KZ1000 A2A
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591644

  • trianglelaguna
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this cat before me had little fork springs with 12" inch pipes in the fork...rigged everything..maybe the nut is from another bike ....or maybe you are messinn with me :P
1976 KZ900 A4 38 years and counting
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591656

  • bluej58
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Your nuts wall looks thicker , mine reads 1- 1/10 " which is a little less than an 1-1/8" obviously.
The one in the pic is off our kz650 but the one on the kz900 outdrive shaft looks the same.
and I ain't messin wit ya :silly:
78 KZ1000 A2A
Last Edit: 1 year 5 months ago by bluej58.
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591657

  • Jeff.Saunders
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Patton wrote:
The 27mm refers to the shaft thread size = internal thread size of the nut.

The socket size to fit the nut is measured as distance between the flats, same as an open end wrench.

1.25" between the flats would be about 31.75 millimeters.
So a 32mm socket should fit the 27mm nut at hand.
And a 1.25" socket might also fit the 27mm nut at hand.

Depends, of course, on accuracy of the measurement between flats.
Measuring in millimeters (with a caliper) would be the better choice for determining metric socket size.

Important to use the correct snuggest fitting socket, due to the sometimes extreme force required to loosen the nut.

If the 1.25" inch socket fits without undue slop, it should work okay.

Good Fortune! :)

27mm is across the hex. 20mm is the thread. The later KZ's came with a 30mm head on the nut. Both are 20mm thread.
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27 mm socket? kz900 front sprocket nut???? 1 year 5 months ago #591659

  • MFolks
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When you get ready to replace the engine sprocket, please remove the grunge from chain lube and who knows what in front of the sprocket. While you're in there, wipe down the clutch push rod with paint thinner. I hope the push rod seal is still good......
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