flywheel bolt comes loose

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24 Feb 2021 11:49 #844010 by nk140
flywheel bolt comes loose was created by nk140
flywheel torque for 750b? I replaced the starter clutch on my 750b. I have torqued the flywheel bolt to 100 ft/lbs and after a few starts it loosens up. Am I missing something?
78 KZ750B

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  • Scirocco
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24 Feb 2021 12:52 #844016 by Scirocco
Replied by Scirocco on topic flywheel bolt comes loose
The torque for the alternator rotor bolt should be 70 Nm = 51 ft-lbs.
Looks like you have over tighten and stretched the bolt.

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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24 Feb 2021 14:19 #844023 by nk140
Replied by nk140 on topic flywheel bolt comes loose
I am an idiot... i was using in-lbs and not ft-lbs. Need another hand to do 100 ft-lbs. I have a 78 750b by the way.
78 KZ750B

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24 Feb 2021 14:24 #844025 by nk140
Replied by nk140 on topic flywheel bolt comes loose
Torque spec for a 78 750b is 87-101 ft-lbs
78 KZ750B

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24 Feb 2021 21:27 - 24 Feb 2021 21:27 #844054 by DoctoRot
Replied by DoctoRot on topic flywheel bolt comes loose
I found it impossible to hit the torque spec with out making a rotor holder.
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
Last edit: 24 Feb 2021 21:27 by DoctoRot.

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25 Feb 2021 10:42 #844095 by nk140
Replied by nk140 on topic flywheel bolt comes loose

DoctoRot wrote: I found it impossible to hit the torque spec with out making a rotor holder.


I had to borrow a second hand and a strap wrench. Got it all torqued and it didn't come free yet after 10 or so starts
78 KZ750B

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25 Feb 2021 10:55 #844097 by DoctoRot
Replied by DoctoRot on topic flywheel bolt comes loose
Nice! I presume the new starter clutch solved your problem?
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike

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25 Feb 2021 12:46 #844100 by nk140
Replied by nk140 on topic flywheel bolt comes loose

DoctoRot wrote: Nice! I presume the new starter clutch solved your problem?


Yep...the kz400 was a direct bolt in. Not one skip. I did save the new springs, pins, and dowels from the messed up one for when this one does fail.
78 KZ750B

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25 Feb 2021 16:52 #844112 by nk140
Replied by nk140 on topic flywheel bolt comes loose
Well that didn't last long. I was periodically starting it today. Spun loose again. I am lost. The manual says nothing about thread locker but should I use some or should try to get a new flywheel bolt?
78 KZ750B

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25 Feb 2021 17:19 - 25 Feb 2021 17:22 #844113 by DoctoRot
Replied by DoctoRot on topic flywheel bolt comes loose
If the bolt threads in by hand there is probably nothing wrong with the bolt. Are there any blemishes on the crank taper or in the fly wheel taper preventing it from seating? these engines spin backwards from so it should be tightening the left hand bolt when it spins. is there something in the thread preventing the bolt from going all the way in? pics might help.
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
Last edit: 25 Feb 2021 17:22 by DoctoRot.

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25 Feb 2021 18:14 #844114 by urankjj
Replied by urankjj on topic flywheel bolt comes loose
Could a kick-starter shaft serve as a rotor holder ?

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26 Feb 2021 09:43 #844134 by Mikaw
Replied by Mikaw on topic flywheel bolt comes loose
Woodruff key?
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
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