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Author Topic: What's the inside diameter of the "eye" of a 750 rear shock?  (Read 1016 times)

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Offline mcswny

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What's the inside diameter of the "eye" of a 750 rear shock?
« on: May 13, 2014, 06:02:45 am »
Anyone know?

Thanks,
Tim
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1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline calj737

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #1 on: May 13, 2014, 07:17:42 am »
The upper and lower mounts should be 10mm.
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Offline 70CB750

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #2 on: May 13, 2014, 07:21:51 am »
He means the shock "eye"  not the stud on the frame, which is M10 thread, but the stud itself is bigger than that.

I can measure it for you later today if nobody pitches in.
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Offline mcswny

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #3 on: May 13, 2014, 07:40:58 am »

Quote from: 70CB750 on May 13, 2014, 07:21:51 am
He means the shock "eye"  not the stud on the frame, which is M10 thread, but the stud itself is bigger than that.

I can measure it for you later today if nobody pitches in.

Exactly, the thread is M10, but then it steps up where the eye sits. If you or anyone happens to be around their bike today and could quickly measure that would be immensely helpful (won't be able to get to my garage till Friday)

Thanks!
Tim
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1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline evanphi

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #4 on: May 13, 2014, 07:59:02 am »
Are you looking for bushings? Honda still sells them.
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1975 CB750K "Rhonda"
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She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
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Offline mcswny

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #5 on: May 13, 2014, 08:27:10 am »
Quote from: evanphi on May 13, 2014, 07:59:02 am
Are you looking for bushings? Honda still sells them.

No, to put a washer between the shock and the frame, there's a little bit of play there.
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1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline evanphi

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #6 on: May 13, 2014, 10:36:13 am »
Quote from: mcswny on May 13, 2014, 08:27:10 am
Quote from: evanphi on May 13, 2014, 07:59:02 am
Are you looking for bushings? Honda still sells them.

No, to put a washer between the shock and the frame, there's a little bit of play there.

The washer goes on the outside of the shock, especially if you have no grab bar. You may be bottoming out your acorn nut?

Part 15 here:
http://www.cmsnl.com/honda-cb750k2-four-usa_model14362/partslist/F20.html#results

Available here: http://www.vintagecb750.com/search/?q=shock (at the bottom).
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--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline mcswny

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #7 on: May 13, 2014, 10:42:15 am »
Quote from: evanphi on May 13, 2014, 10:36:13 am
Quote from: mcswny on May 13, 2014, 08:27:10 am
Quote from: evanphi on May 13, 2014, 07:59:02 am
Are you looking for bushings? Honda still sells them.

No, to put a washer between the shock and the frame, there's a little bit of play there.

The washer goes on the outside of the shock, especially if you have no grab bar. You may be bottoming out your acorn nut?

Part 15 here:
http://www.cmsnl.com/honda-cb750k2-four-usa_model14362/partslist/F20.html#results

Available here: http://www.vintagecb750.com/search/?q=shock (at the bottom).

Yeah I have that washer, its the 10mm between the acorn nut and the shock.

What I'm saying is I have some play on the stepped up part of the bolt, where the actual eye of the shock sits so I'm needing to put a washer between the shock itself and the frame.
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1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline 70CB750

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #8 on: May 13, 2014, 12:44:59 pm »
The shock I have has 22mm and 24mm inner diameter of the top eye. The eye is not cylindrical, the smaller diameter is in the middle of the eye.
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Offline mcswny

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #9 on: May 13, 2014, 12:49:06 pm »
Great, thanks!
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1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline Timindecaturga

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Re: What's the inside diameter of the "eye" of a 750 rear shock?
« Reply #10 on: May 13, 2014, 02:16:18 pm »
1978 750f


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