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Author Topic: Hagon shock installation, my way - uh oh...  (Read 3000 times)

Bulletman

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Re: Hagon shock installation, my way - uh oh...
« Reply #45 on: May 04, 2013, 04:24:26 PM »
My guy says he's got so many studs and bolts of all shapes, sizes and grades around that he's certain he'll have what he needs, but just in case I need to buy one - what size bolts did you end up getting?
Matt, follows the  size:
the Metric version is:
M-10 (Fine Thread) x 1.25 Pitch, with a grade 10.9 Metric which should be a grade 8 in US measurements. I got this at a Huge Tractor & Farm  supplier here in CA. Fastenal also had them in stock, but wanted me to buy a minimum bag of 25 Nuts and a bag of 25 Bolts for about $45.00... :(
"A Blast from my Past"
Mark F   (Northern, CA)
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mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #46 on: May 06, 2013, 06:29:37 PM »
Well, here's an interesting development: my swing arm studs, and the top mount bolts, aren't 10 mm diameter.  My machinist discovered this when he measured the broken stud.  I have my dial caliper and everything else before me: OEM top bolt, .368" (9.35mm).  OEM stud, .373" (9.47mm).  Maybe it's meant to be 9mm?  But since none of us here has ever come across such a thing, we weren't sure.  The thread is a perfect metric 1.25 pitch.

In the end, he decided the prudent thing was to match the three existing fasteners as best he could, so he welded on a 3/8" bolt, which measures .370" (9.40mm) and splits the difference.  The only thing is, it's a different thread, but who cares, I suppose.

I ordered 10 mm bushings for my Hagon shocks (based on the recommendation of others here on the forum who have all ordered 10 mm bushings, and of Dave Quinn).  The Hagons are loose.  Looser than the OEM shocks, as you might imagine.  Just for grins, I tried a new 10mm bolt in the 10mm bushings for size, and it's a perfect fit.  I measured my OEM shock bushings: they have an ID of .379", or 9.63mm.  The new 10mm bushed Hagon bushings have an ID of .393", or 9.98mm.  I didn't measure the 10mm bolt, nor did I test fit it in the OEM shock, but the fit on the Hagon was so close, I kind of doubt it would have fit the smaller OEM bushing, but I don't know.

I'm not sure what-all is going on with all these measurements, but in a nutshell, all of my shock mounting hardware is about the same size - only it's not 10mm.  It's all about 20 thou smaller than the bushings.

My guy wiggled the fit-together parts a bit before suggesting that I wasn't setting up a race bike, and if it were his, he'd just put it back together and forget about it.

The repair is done, and I think he did the right thing by matching the existing sizes.  But now I have to decide about whether to worry about the bushings.  Since Dave Quinn only offers 8mm and 10mm bushings, maybe I should follow my guy's advice and just ride the darn thing.

Is a 10mm bushing on a 9.4mm stud too loose?  Any thoughts or advice? 

Ducati Scotty

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Re: Hagon shock installation, my way - uh oh...
« Reply #47 on: May 06, 2013, 06:33:43 PM »
I'm guessing mine were the same size as yours and I haven't had any issues, nor has anyone else.  I'm guessing you'll be just fine.  Make sure you get a nice chromed acron nut for the new 3/8" stud, don't want a bare end sticking out.

Scott

mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #48 on: May 06, 2013, 07:04:11 PM »
Not a perfect match, but who's counting?


Ducati Scotty

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Re: Hagon shock installation, my way - uh oh...
« Reply #49 on: May 06, 2013, 08:13:32 PM »
Looks good to me :)

mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #50 on: May 06, 2013, 09:09:19 PM »
It seems 3/8-20, which is what these shock bolts seem to be, is not an uncommon British size - could it be a holdover?

Ducati Scotty

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Re: Hagon shock installation, my way - uh oh...
« Reply #51 on: May 06, 2013, 09:11:55 PM »
Maybe.  I know the swingarm pivot bolt is 12.5mm, which I've never heard of but is the same as 1/2".  Could be they didn't want to re-engineer the rest of the parts.

Scott

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Re: Hagon shock installation, my way - uh oh...
« Reply #52 on: May 06, 2013, 10:34:38 PM »
I'm not sure how strong your chrome nuts are but if your mechanic torqued them to something around 18-20 ft/lbs they should be OK.

At that torque each nut will be developing about 3000+ pounds of pressure or squeeze on the end of the shock.  It won't be moving around or going anywhere so just ride your bike and enjoy. :)
Jim
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mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #53 on: May 06, 2013, 10:55:34 PM »
Well, Jim, my mechanic is me, which probably explains why it broke in the first place!  I'll not be following the manual torque specs for the shocks from now on...

Gotta paint the weld spot, and re-assemble!

High On Octane

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Re: Hagon shock installation, my way - uh oh...
« Reply #54 on: May 06, 2013, 11:27:23 PM »
Well, Jim, my mechanic is me, which probably explains why it broke in the first place!  I'll not be following the manual torque specs for the shocks from now on...

Gotta paint the weld spot, and re-assemble!

Awesome!  Glad you got it squared away with minimal headache.  Way To Go Matt!!!    :D

Scottie
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mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #55 on: May 07, 2013, 11:25:50 AM »
Ready to paint the swing arm plate.  I've got two paint issues going in two threads, so I've posted question here:

http://www.enfieldmotorcycles.com/forum/index.php/topic,16407.0.html

mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #56 on: May 07, 2013, 10:19:21 PM »
Swing arm all repaired and painted - no pics (yet), but it really did happen!  Will let the paint dry for a couple of days before I reinstall it - I start my 7-day, 12-hour-a-day work week tomorrow anyway, and the weather is supposed to turn sour through the weekend...

mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #57 on: May 15, 2013, 12:27:08 AM »
Finished.  Swing arm, with new Hagon shocks (and K70 rear tire!), installed:



Thanks, as usual, for all your help, guys!  I haven't taken a ride yet, since I am again, momentarily, without a fuel tank on the bike. 

Bulletman, what's your status?

High On Octane

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Re: Hagon shock installation, my way - uh oh...
« Reply #58 on: May 15, 2013, 01:17:53 AM »
Awesome job Matt!  I told you that you wouldn't even be able too tell when you were done.  ;)  Way to stick with it, it came out great.

Scottie
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mattsz

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Re: Hagon shock installation, my way - uh oh...
« Reply #59 on: May 15, 2013, 01:20:20 AM »
I told you that you wouldn't even be able too tell when you were done.  ;) 

WRONG, Scottie - I have a much cooler-looking acorn nut on the repair side! ;D

Seriously - thanks a bunch!