Suspension bolts & the MoT?

[Ted]

Probably a bit of a can of worms here.

Would an 8.8 rated bolt on a mono shock unit be an MoT pass/fail?

This is more of an academic question than anything else, as I'm intending to buy a new (correct) bolt, but I'm just intreged...

[Monkeywrenche...]

https://www.mot-testing.service.gov.uk/documents/manuals/m1s02000401.htm
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2001 Aprilia RSV Mille R -dead, 2016 XSR 700-gone, 2018 Dorsoduro 900

[colink98]

that looks very similar to the back of my CBF.
That should be a CAP head bolt which sits in the recess on the left.

as a normal bolt is smaller in diameter than the recess, how are you stopping it from having excessive movement ?

id suggest the MOT bloke is going to have a look and might refer to this part of the rules

deliberate modification which significantly reduces the original strength, excessive corrosion, severe distortion, a fracture or an inadequate repair of a load bearing member or its supporting structure


its most probably not that use of that bolt but rather the bolt not fitting correctly.
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PCX125 (stolen) - CBF600 (current)
Ride it like you stole it.
ride sensible and not like an idiot and you wont get 6 points in one week.

[arry]

Would seem it's a bit grey and I'd expect it to get an advisory only, subject to it actually being secure.

[colink98]

Also if it is the read end of a CBF the correct CAP bolts cant be found at Screw fix/Tool station.

you have to get them off the inter webs.

im 99% sure when i replaced my one, i ordered a spare.
happy to dig it out and post it if it helps.
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PCX125 (stolen) - CBF600 (current)
Ride it like you stole it.
ride sensible and not like an idiot and you wont get 6 points in one week.

[Polarbear]

I would suspect if there is no play in it you would probably get away with it as the tester won't be specifically looking at the bolt.

If he detects play and then has a good look I would expect that to be a fail.

This is purely guess work though, going on how my tester checks the suspension.
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Triumph Trophy Launch Edition

[stinkwheel]

8,8 should be strong enough in terms of tensile strength. You're using a locknut so there are no worries regarding security.

Therefore it's all down to fit. Of there is no play and it's not fouling anything, I see no reason it shouldn't pass. If there is play, it should fail.

You could probably argue that there shouldn't be a threaded section inside the shock bushing too but the MOT tester can't see that.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[piazza]

It looks like the bolt is already bending to my eye. I'd be changing it regardless of MOT decision. It's probably less than a fiver for the right one fom Amazon.

[Ted]

It is a CBF, and yes the original bolt head sits in a recess. I had to make a spacer out of the original bolt head (photo attached).

As I fitted a second hand shock I needed to test it, so couldn't just fit the bolt without a way of holding it firmly.

[Ted]

[P.]

I'd be amazed if anyone gave a toss. Chuck a bit of black paint or dirt on it and thats that done.

[Courier265]

[redeem ouzzer]

I’m boring the centre out of all my suspension bolts anyway. For speed add lightness.
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Be a REAL MAN!

[P.]

[arry]

There's a back story here, I'm sure of it. I'm just not in the picture.

[P.]

[P.]

[Courier265]

[Nobby the Bastard]

[P.]

I can't put both feet down when I rode my TTR600, didn't die. Did ride. Just incompetent rider too short for this world.

[Ted]

My CBF is too low for me really, and I keep catching my feet on the road on roundabouts and tight corners.

[Islander]

[Pete.]

Doubtful that MOT would notice but what you've put in is a long way from being adequate IMO. It's already visibly bending in the photo.

You've removed a M12 fine thread shouldered cap screw for a hardware- store M12 coarse bolt. Just losing the shoulder and measuring down to the thread's minor diameter loses you 71% of cross-section. Now the bolt (screw, actually) that's fitted is probably 8.8 grade but socket cap heads are 10.9 or 12.9 - each 125% and 146% stronger respectively - that's if the new fastener even reaches 8.8 spec.

A 71% reduction in cross-section and possible 65% reduction in strength makes your replacement bolt as poor as 46% the capacity of the one you've replace.

Time to re-evaluate what you have there IMO.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Ted]

[arry]