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Author Topic: 1976 k crank pin bearings  (Read 947 times)

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Offline bomorr

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1976 k crank pin bearings
« on: May 14, 2017, 02:59:41 PM »
After tearing my motor apart I am trying to determine what bearings I need to use when I rebuild it. I've done the table crank/ case and I know what it had originally but before I order $200 in bearings I want to make sure I have the right ones. After double checking my crank pins I measure a few of them at 35.095. This is way below anything on thr tables I see. Do I need to start looking at a replacement crank?

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Offline 754

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Re: 1976 k crank pin bearings
« Reply #1 on: May 14, 2017, 03:08:47 PM »
What are you measuring with? I would not trust a caliper. Micrometer needs to be checked with a standard.
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Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline bomorr

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Re: 1976 k crank pin bearings
« Reply #2 on: May 14, 2017, 03:14:37 PM »
Yea I am using a caliper, my micrometer set is still on its way

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Offline BPellerine

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Re: 1976 k crank pin bearings
« Reply #3 on: May 14, 2017, 05:32:39 PM »
did you plastigauge them,you can just buy,one set of say green and brown and see where you are instead of buying all at once.bill
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1978 CB 750K ard and webers
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Offline bomorr

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Re: 1976 k crank pin bearings
« Reply #4 on: May 14, 2017, 06:41:47 PM »
Haven't done any plastigauge yet either, I'm picking up some sleeves tomorrow. So I can gauge where I'm at with the  Current bearings that were in the bike

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Offline bomorr

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Re: 1976 k crank pin bearings
« Reply #5 on: May 15, 2017, 02:16:56 PM »
Ok just went through my crank pins again and they consistently get 35.9918 or 1.417". For a minute there I thought I was going to have to get a new crank! So I should be able to go green  bearings and double check with plastigauge

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