Front axle pinch bolt snapped? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 9 Old 05-20-2014, 11:10 AM Thread Starter
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Front axle pinch bolt snapped?

I noticed the ride just didn't feel right up front, a slight shimmy or shake. Took a look-see and found the front axle pinch bolt head was gone. The other half of the bolt is still in there and threaded out the other side so somehow this bolt snapped in half. Could it have been over-tightened and snapped when hitting a bump?

I'm hoping someone can school me on what happened here and what I can do to fix it. I'm thinking I can get the bolt out ok, and assuming there's threads, a new bolt will suffice, but, I'm concerned what caused it to snap as I'd really rather it didn't happen again.

It's a big club, and you aint in it.....G.C.

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Last edited by futo; 05-20-2014 at 11:15 AM. Reason: oops
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post #2 of 9 Old 05-20-2014, 11:40 AM
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Who was the last person to put that bolt in? It was probably over torqued. The spec is 16.5lb-ft or 23Nm and it's a good spec.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #3 of 9 Old 05-20-2014, 06:26 PM
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Over torqued and a combination of thread lubricant or anti-seize together would do it. Are the threads dry?? I got rid of one mechanic b/c he constantly over-torqued. The consequences can be failure at a very bad time. Lubing the threads makes torque values drop (you need less torque) but no one knows that.

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post #4 of 9 Old 05-20-2014, 07:09 PM
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I can't see how a broken or missing pinch bolt can cause a weave in the front end. After all, it's only there to keep the axle from backing out. Or had that begun to happen?
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post #5 of 9 Old 05-20-2014, 07:38 PM
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Quote:
Originally Posted by dovetailredux View Post
it's only there to keep the axle from backing out.
That is not the case. The only things holding the fork legs parallel and on the same stroke length on the stock bike are the triple clamps and the axle. The axle is a long way from the triple clamps. If the axle is not being pinched, it is much easier for the forks to twist and the wheel to wobble. The heavier and more powerful Vee has a larger diameter axle and dual pinch bolts for a reason. There is also a reason why fork braces are so popular. Losing the head on the pinch bolt will make handling squirrelier.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #6 of 9 Old 05-20-2014, 07:49 PM
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Interesting, explained that way it makes sense. Thanks.
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post #7 of 9 Old 05-21-2014, 01:11 AM
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Quote:
Originally Posted by Stromburger View Post
Over torqued and a combination of thread lubricant or anti-seize together would do it. Are the threads dry?? I got rid of one mechanic b/c he constantly over-torqued. The consequences can be failure at a very bad time. Lubing the threads makes torque values drop (you need less torque) but no one knows that.
Good point. How much should one reduce the torque by? haven't had to work on the bike yet but plan on adding crash bars etc.
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post #8 of 9 Old 05-21-2014, 01:30 AM
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The pinch bolt is stainless steel in aluminum. It should be installed clean and dry. It isn't going to seize. There are tables for torque reduction for various materials and lubricants. SS on SS tends to gall and I've had good luck with using 80% of the spec with anti seize to prevent galling but that is a different situation.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

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post #9 of 9 Old 05-21-2014, 07:07 PM
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Will have to check online for some tables. Have been using a mix of 20w and moly paste on the CX when I reassemble it each spring. Which means I have probably been over torquing by about 20%. Haven't snapped a fastener yet. Think i'll go back and retorque a few though.

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