Author Topic: F1 top yoke fork clamp bolt  (Read 310 times)

Offline Rickman Pete

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F1 top yoke fork clamp bolt
« on: May 07, 2020, 09:46:03 PM »
Hi all

I have a weird issue

I have a f1 top yoke fitted to my rickman cr750.

The manual shows the bolt as m8 56mm

The ones i have which fit perfectly  are m8 40mm

56mm will hang out miles

Is there another model or something I'm missing as i need to.replave these bolts as plating is wrecked

Offline hairygit

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Re: F1 top yoke fork clamp bolt
« Reply #1 on: May 07, 2020, 10:01:08 PM »
F1 top yoke bolt SHOULD be M7, in an effort to reduce the risk of overstressing and cracking the clamps. If a PO has drilled it to 8mm, look for another yoke to be safe as you cannot tell if it's been overstressed until it lets go, which you do not want while braking hard!

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Offline Rickman Pete

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Re: F1 top yoke fork clamp bolt
« Reply #2 on: May 07, 2020, 10:18:42 PM »
The manual says m8? So does david silver parts list

Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: F1 top yoke fork clamp bolt
« Reply #3 on: May 07, 2020, 10:36:34 PM »
The manual says m8? So does david silver parts list
Im sure Mr Hairy is correct M7 x54 according to CMS
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Offline hairygit

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Re: F1 top yoke fork clamp bolt
« Reply #4 on: May 07, 2020, 10:43:33 PM »
Which bolt are you referring to, the one that holds the yoke to the steering stem or the pair that clamp the top of the fork legs?

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Offline Rickman Pete

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Re: F1 top yoke fork clamp bolt
« Reply #5 on: May 07, 2020, 10:58:24 PM »
Leg clamp bolts

Offline Nurse Julie

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Re: F1 top yoke fork clamp bolt
« Reply #6 on: May 07, 2020, 11:09:48 PM »
7x54 bolt with D washer, washers and nut.
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« Last Edit: May 07, 2020, 11:12:16 PM by Nurse Julie »
Im a Nurse, trust me, this won't hurt.....much !!!

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http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Rickman Pete

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Re: F1 top yoke fork clamp bolt
« Reply #7 on: May 08, 2020, 12:09:43 AM »
No 25. But that photo isnt of my set up as mine ate bolts and no nuts theyre threaded i to yoke only 40mm legnth

Offline Rickman Pete

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Re: F1 top yoke fork clamp bolt
« Reply #8 on: May 08, 2020, 12:13:59 AM »
** are not ate sorry

Offline SteveD CB500K0

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Re: F1 top yoke fork clamp bolt
« Reply #9 on: May 08, 2020, 07:00:32 AM »
You can edit your posts Pete (just not anybody else’s)

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Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: F1 top yoke fork clamp bolt
« Reply #10 on: May 08, 2020, 09:14:18 AM »
Pete, consider putting the photo you put on FB of the top yoke on here, someone may be able to identify it.
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline Rickman Pete

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Re: F1 top yoke fork clamp bolt
« Reply #11 on: May 08, 2020, 11:28:09 AM »
This may help

Please note the similarity to the f1 yoke but not a through bolt with nut and yoke isn't machined to suggest it should be either.

Might be worth ignoring the light cluster as that may or may not be the right one for yoke as previously suggested on fb

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Offline Bryanj

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Re: F1 top yoke fork clamp bolt
« Reply #12 on: May 08, 2020, 11:58:52 AM »
What diameter are the forks, that looks like GL1000 but they have bigger dia forks

Offline Moorey

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Re: F1 top yoke fork clamp bolt
« Reply #13 on: May 08, 2020, 01:09:39 PM »
The bottom one doesn't look like a f1 either.
« Last Edit: May 08, 2020, 01:13:57 PM by Moorey »

Offline Rickman Pete

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Re: F1 top yoke fork clamp bolt
« Reply #14 on: May 08, 2020, 01:27:42 PM »
36mm diameter z650 forks k207

Your right i believe the bottom one isn't. Top ones not off a z jason a kh has confirmed that but is identical to f1 except the bolts

 

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