Question about a Double Square bit - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 19 Old 03-31-2017, 04:47 PM Thread Starter
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Question about a Double Square bit

Hey all, I was pulling my steering head today on my Super Tenere (I know, not a V-Strom, but this isn't a Super Tenere specific question) when I ran across a dilemma. I posted on the Super Tenere site but it can take ages to get someone to respond to a tech question, so Stromtroopers is always my go-to site.

Anyway, a special locknut wrench is needed to loosen the locknut on the steering head stem. I have the wrench, which is designed to be used with a torque wrench for reassembly. On this wrench is a weird 8 pointed hole, similar to a 6 point Torx bit. My research says this is called a Double Square, which I'd never heard of. I found that a 3/8" ratchet or a 3/8" extension will fit into four of the eight holes in the wrench, but I'm not sure if it's kosher to use the wrench this way. None of the usual places I've looked (Amazon, McMaster Carr, Home Depot, hardware store, etc) sell anything that looks like an 8 point Torx bit that will fit with a 3/8" ratchet. I've only seen a couple places that sell a double square screwdriver bit, but they are way too small (this hole would require a bit around the size of a T55 Torx bit).

Have any of you ever encountered this, and what did you do? Did you just use the 3/8" ratchet/extension, or do you have to use the specific 8 pointed double square bit? And if you have to use the double square bit, do you have a source for them? It's going to suck if I have to put the forks back on without being able to complete my maintenance on the steering head.....

I've attached photos of the wrench and ratchet.
Attached Images
File Type: jpg Locknut wrench.jpg (77.8 KB, 27 views)
File Type: jpg IMG_20170331_152826129.jpg (76.1 KB, 28 views)
File Type: jpg IMG_20170331_152641131.jpg (76.3 KB, 24 views)

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Last edited by RCinNC; 03-31-2017 at 06:48 PM.
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post #2 of 19 Old 03-31-2017, 05:04 PM
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I haven't dealt with this but I wouldn't hesitate to use the ratchet as long as you believe it fits tight enough not to strip out when applying the proper torque.


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post #3 of 19 Old 03-31-2017, 05:55 PM
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Clearly a 3/8" ratchet/extension fits with enough contact area to avoid rounding out the star, especially since only so much torque can be applied by a 3/8" ratchet compared to a 1/2" one.
While I have never seen this setup, would not hesitate to go ahead with your plan.
Reminds me of an M4 carbine receiver extension locking tool.
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post #4 of 19 Old 03-31-2017, 06:02 PM
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What does the star points measure straight across ? There is no problem using your 3/8 ratchet with this or a torque wrench for that matter...Could be a metric Torque size.
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post #5 of 19 Old 03-31-2017, 06:32 PM
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That's normal. It's made so that you can use a 3/8" drive beam type torque wrench. It allows for multiple positions of the torque wrench in relation to the spanner wrench.

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post #6 of 19 Old 03-31-2017, 07:31 PM
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Quote:
Originally Posted by RCinNC View Post
Hey all, I was pulling my steering head today on my Super Tenere (I know, not a V-Strom, but this isn't a Super Tenere specific question) .....
RCinNC, I find the Tenere thread on ADVrider is as good or better than the YamahaSuperTenere Forum for tech help. BTW, mine is still new, how much grease you find in there when you disassembled it?

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post #7 of 19 Old 03-31-2017, 07:46 PM Thread Starter
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I couldn't say, ST: I quit working on the steering head and went back to doing the forks. Surprisingly, the fork oil looked like new; I didn't expect that at 33,500 miles. I'll pull the head tomorrow and see how much grease is there.

If you do yours, be ready to use a breaker bar on the steering head nut. The specs are for, if I recall correctly, 94 ft/lbs, and every bit of that was on the nut.

Thanks for the heads up on ADV Rider. I'm actually a member there, but I don't go there too often. They seem to lean a little too far to the caustic snarky side, and I hate to wade through a ton of BS just to get an answer to something like "what's a double square bit?". I'll have to reacquaint myself with their forum.

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post #8 of 19 Old 03-31-2017, 07:51 PM Thread Starter
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Thanks to everyone who responded about using the 3/8" torque wrench. It seems like a no-brainer, but I wanted to confirm it before I did something stupid and wrecked that wrench. Even on eBay it wasn't cheap, and I'd hate for the bike to be sitting in pieces in the garage while I wait for another tool to be shipped to me.

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post #9 of 19 Old 03-31-2017, 11:13 PM
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RCinNC,

There are parts of ADVrider that are snarky, but the Tenere forum is a great bunch of guys. Let me know about the steering head bearings and I am curious if you ever checked the valves yet and what they measured at?

My 2013 went 40,000 miles. I did valves at 30,000 and the exhausts were right on the tight end of the range, the intakes were OK. The Tenere is such a bitch to adjust valves on that I left them alone. I upgraded to a 2015 when I totaled the 13. My 15 just hit 6,500 miles.

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post #10 of 19 Old 03-31-2017, 11:33 PM Thread Starter
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Hi ST,

I had the valves checked at 31,000 miles, and all of them were within specs. I don't have the sheet that says what the exact clearances were, though.

The steering head's coming the rest of the way off in the morning, and I'll let you know what the grease looked like. I can take a photo; I'll have my camera anyway, since I was taking photos of my new homemade fork spring compressor in action.

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