Those damned fine threads - Kawasaki Versys Forum
 
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post #1 of 10 (permalink) Old 07-08-2009, 11:26 AM Thread Starter
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Those damned fine threads

As I prepare to build my crash bars for the V I've noticed that yet again the front motor mount bolts seem to have a fine thread pitch of 1.25 (same as the spools). I'm getting a little tired of running around searching endlessly for these screws. It's hard enough to fine a zinc plated (let alone stainless) M10 with a corase pitch.

The bolts use a nylong lock-nut to match the screw so there is nothing to stop me from swapping both for a coarse thread setup. I noticed that the SW-Motech crash bars supply their own lock-nuts, I wonder if that's because they swapped threads, anybody with these able to confirm? The Hepco & Becker bars on the other hand supply a find thread screw and rely on the original lock-nut.

It's my understanding that fine threads allow for greater torquing and probably greater clamping strength, but the difference seems minute. Anyone have an idea as to why all those fine thread screws?
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post #2 of 10 (permalink) Old 07-08-2009, 12:35 PM
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Post pictures of your build, i am thinking of building my own.
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post #3 of 10 (permalink) Old 07-08-2009, 12:46 PM
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Not sure if they have a Home Depot in QC, but any good hardware store should have a selection of stainless metric fine thread stuff. In my part of the world (Seattle WA area), we have 3 different stores that carry a good selection. They are not with the 'normal' nuts and bolts, they are typically in metal trays. I actually replaced the hardware on my H&B because it looked a bit wimpy to me.
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post #4 of 10 (permalink) Old 07-08-2009, 04:45 PM
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You should be able to find what you are looking for at Fastenal. There might be a store near you but it looks like you can order from their website. Ordering bolts through the internet seems a bit silly but at least it's an option.


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post #5 of 10 (permalink) Old 07-09-2009, 12:21 AM Thread Starter
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Thanks, we're lucky enough to have a Home Depot, but they don't carry fine thread. I've found a local screw supplier that can get them on special order, but that means I won't be able to get it done this weekend. Darn!

kmahorney: I'm still designing at this stage and building a dye to bend pipe, but here's a bit of info on what I'm doing:
- I'm using 1" OD pipe with a 1/16" wall. Other bars seem to use 1" tubes. I just can't tell what thickness. Anything thicker than 1/16" would be very hard to bend anyways. I will curve it to an approx. 2.5" inner radius.
- My attachment points will be the front engine mounting bolt, a U-bolt attached to the lower visible frame tube (much like the Sw-Motech bars with a rolled piece of ABS to protect the frame) and a tube running above the radiator to tie both sides of the bars together (without touching any part of the bike, like the H&B design).

I'm trying to build some flexibility into the design to absorb an impact. Better to deform the bars than transmit a hard impact onto the frame and risk damaging it. The 1/16" pipe will help since it's somewhat flexible.

Here's a drawing of a rough outline. I'll post pictures when I'm done.

Here are the installation instructions for the SW-Motech and H&B bars to get and idea of how they're put together. There's a few good pictures from members on the forum too.
Attached Files
File Type: pdf HB crash bars.pdf (527.7 KB, 72 views)
File Type: pdf SW-Motech crash bars.pdf (933.9 KB, 48 views)

Last edited by jonny2001; 07-25-2009 at 11:44 PM.
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post #6 of 10 (permalink) Old 07-09-2009, 05:45 AM
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Hi Joony2001,

and in your DIY engine guard project.
IMHO, it's good to have those bars further out than the turn signal indicators.

For fine vs course thread screws:
http://www.boltscience.com/pages/faq.htm#5

My V Blog:
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Ride safe,
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post #7 of 10 (permalink) Old 07-09-2009, 09:09 AM
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Thanks for the info and good luck with the build...
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post #8 of 10 (permalink) Old 07-09-2009, 07:01 PM
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Quote:
Originally Posted by jonny2001 View Post
Thanks, we're lucky enough to have a Home Depot, but they don't carry fine thread. I've found a local screw supplier that can get them on special order, but that means I won't be able to get it done this weekend. Darn!
check Valley Hardware, behind Good Times on Bentley ave... Don't know about that specific bolt, but they have a huge selection...
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post #9 of 10 (permalink) Old 07-09-2009, 10:21 PM Thread Starter
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That's exactly where I found them. They're pretty good. They couldn't get the screws for my spools (also M10x1.25 but socket head), but they can get almost anything.

stlee29: good call. I don't want to have to replace another one of those.
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post #10 of 10 (permalink) Old 07-14-2009, 10:06 PM
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Ace Hardware has a great slection of all kinds of fasteners metric and sae, That is about all they are good for.

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