kz750 cylinder head nuts - change

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18 Sep 2013 13:02 #606929 by undiablo
kz750 cylinder head nuts - change was created by undiablo
Hello guys!

My engine is running very nice now, so I am doing some fancy cleaning and chrome.
The original cylinder head nuts (8) are pretty old by now and the chrome is fading.
The nut is still available from Kawasaki, the question is:

Can I remove one nut and replace with a new one, and so on until the 8, applying factory torque with out the risk of a gasket leak?

Kawasaki KZ 750/4 LTD 1981
Kawasaki KLR 650 2011
Argentina - Buenos Aires

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18 Sep 2013 13:25 #606933 by Nebr_Rex
Replied by Nebr_Rex on topic kz750 cylinder head nuts - change
Yes, and retorque the head after a heat cycle.
And use some lube on the threads for a proper
torque reading.


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2002 ZRX1200R
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected

www.dotheton.com/forum/index.php?topic=39120.0


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18 Sep 2013 17:13 - 19 Sep 2013 00:34 #606952 by Patton
Replied by Patton on topic kz750 cylinder head nuts - change
To anyone who might be unaware, re-torquing after a heat cycle means first getting the engine up to normal operating temperature, and then allowing the engine to cool until it's stone cold (as in leaving the bike parked overnight), and torquing the head fasteners on the stone cold engine (in the tightening pattern as specified in the Factory Service Manual a/k/a "FSM").

I don't use any lube incident to the re-torque.

Good Fortune! :)

1973 Z1
KZ900 LTD
Last edit: 19 Sep 2013 00:34 by Patton.
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18 Sep 2013 20:14 #606973 by undiablo
Replied by undiablo on topic kz750 cylinder head nuts - change
Thanks for explanation Patton... was just about doing it the wrong way.
I should read more!

Kawasaki KZ 750/4 LTD 1981
Kawasaki KLR 650 2011
Argentina - Buenos Aires

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19 Sep 2013 00:14 #607007 by RonKZ650
Replied by RonKZ650 on topic kz750 cylinder head nuts - change
They have used 3 different nuts for the head over the years, I forget the exact names, but the first one was the one with the bulged top, quickly discontinued, then on the KZ650 they had the tall chrome head nuts on the outer bolts and the inners used flanged open nuts. Probably by 1980 they used all the tall chrome nuts if that is what you are after and still available I'm surprised, they used the flange nut over the years in many models for many purposes. I like the look of the open nut better than the 1.5" tall things.

321,000 miles on KZ's that I can remember. Not going to see any more.
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