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Weeksy

Swingarm pivot bolt nut torque ?

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Weeksy

Morning fellas.

Last week i noticed this.... 

51942109674_0516f58306_5k.jpg2022-03-16_02-06-29 by Steve Weeks, on Flickr

 

It seems the chain adjuster nuts came loose and smacked the swingarm up. Oh well, not a lot i can do on that.... apart from fix it of course.

So i've just got  a Swingarm in the mail today. But wanted to confirm the torque for the nut at the pivot point. From what i can see it should be 52Nm ? 

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Weeksy

Swingarm is nice... most happy with it... but thought i'd look and see how the chain adjuster ends worked as it is.

Here's the bent one

51952584670_b7f622cdbd_5k.jpg2022-03-21_12-23-18 by Steve Weeks, on Flickr

Straight one in there
51952292104_5dbe8fe25a_5k.jpg2022-03-21_12-22-58 by Steve Weeks, on Flickr

Loosely fitted.
51952291934_b397db35fa_5k.jpg2022-03-21_12-22-48 by Steve Weeks, on Flickr

51952583980_459cb322c2_5k.jpg2022-03-21_12-22-40 by Steve Weeks, on Flickr

51952291539_0a44f629ca_5k.jpg2022-03-21_12-22-29 by Steve Weeks, on Flickr

So the metal coloured end cap fits into the slot of the swingarm, so 95% of it is fully attached and correct. It's going absolutely nowhere.

So it'll stay like that until me and Crust get time.

Yes, i've torqued up the nuts this time lol

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Triple Jim

You could use an adjustable wrench to bend the end of the swing arm straight, or nearly straight

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Weeksy
11 hours ago, Triple Jim said:

You could use an adjustable wrench to bend the end of the swing arm straight, or nearly straight

Indeed mate, that's going to be the plan, then a bit of touch up paint on it to make it tidy.. I ended up sending the swingarm back i was going to fit.

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cornerslider
2 hours ago, Weeksy said:

Indeed mate, that's going to be the plan, then a bit of touch up paint on it to make it tidy.. I ended up sending the swingarm back i was going to fit.

I would advise against that.... I have over 30 years experience as a Pipefitter/Welder. I also have experience repairing the FZ-07 swing-arm. They don't really use the best quality materials. They are made of what I would describe as "pot-metal", a low quality (cheap) material. They steel they use, is very similar to aluminum, as in it can be bent ONCE, and retain 99% of it's original strength. Bend it back to it's original shape, and you will lose a considerable amount of strength. Yamaha does an AMAZING job on the engineering side, to be able to use lesser quality materials, and not have structural failures. As tempting as it is to bent it back- DON'T.....😎

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""W.O.T. until you see god, then brake"

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Triple Jim
Posted (edited)
Just now, cornerslider said:

As tempting as it is to bent it back- DON'T.

If that very small bent section broke off, the swing arm would be no less strong than it is now.

Edited by Triple Jim
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cornerslider
Just now, Triple Jim said:

If that very small bent section broke off, the swing arm would be no less strong than it is now.

It could still make small cracks where it broke off.... You most likely you wouldn't be able to see such small cracks without a magnifying glass. Cracks NEVER "heal"- they only get worse with time.... It's just what holds the rear wheel in place, so not a big deal 🙄-

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""W.O.T. until you see god, then brake"

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Weeksy

Anyway, we never did get to the discussion on the torque setting ?

 

As it rained i thought, well now is as good a day as any to get it ready.

I've not removed the swingarm just yet, but there's only the main pivot bolt to get out and the shock mount bracket bolt to do as well.

I've got it ready on the straps, with a trolley jack underneath, i'll get the front brake on as well do it doesn't move.... hopefully lol. I may need a grown up for stage 2 once the swingarm arrives [mention]2xtwins[/mention] [mention]Tricky[/mention] [mention]dern[/mention] [mention]crust[/mention] 

51985907213_10fbb563f0_5k.jpg2022-04-06_09-02-24 by Steve Weeks, on Flickr

51985845656_92ed499383_5k.jpg2022-04-06_09-02-14 by Steve Weeks, on Flickr

51985845486_30dc6104d3_5k.jpg2022-04-06_09-02-06 by Steve Weeks, on Flickr

51985906778_668190c639_5k.jpg2022-04-06_09-01-56 by Steve Weeks, on Flickr

51985906558_8ff9511d65_5k.jpg2022-04-06_09-01-47 by Steve Weeks, on Flickr

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shinyribs

Don't tighten the hell out of it. Yes, it's a critical fastener, that doesn't require that we stand on the wrench, though. It's got a Fuji nut anyway. Snug her up good and tight and rock on ✌️

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shinyribs
On 3/23/2022 at 12:11 AM, cornerslider said:

I would advise against that.... I have over 30 years experience as a Pipefitter/Welder. I also have experience repairing the FZ-07 swing-arm. They don't really use the best quality materials. They are made of what I would describe as "pot-metal", a low quality (cheap) material. They steel they use, is very similar to aluminum, as in it can be bent ONCE, and retain 99% of it's original strength. Bend it back to it's original shape, and you will lose a considerable amount of strength. Yamaha does an AMAZING job on the engineering side, to be able to use lesser quality materials, and not have structural failures. As tempting as it is to bent it back- DON'T.....😎

What you're describing sounds like the infamous bedframe steel - bend it back and it starts snapping, regardless of that fact that it's strong as hell in normal use. 

 

That makes sense beings it's a swingarm. They wanted it light and rigid, being formable wasn't a concern after initial forming 🤔

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M. Hausknecht

Main swing arm nut torque should be 110Nm or 81 ft/lbs. Good luck!

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Weeksy
Just now, M. Hausknecht said:

Main swing arm nut torque should be 110Nm or 81 ft/lbs. Good luck!

Fabulous... thanks mate.

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