Subframe Failure? - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 70 (permalink) Old 01-08-2019, 01:29 PM Thread Starter
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Subframe Failure?

Still new to my FJR and reading about some subframe failures when bike is loaded with a top case.
I ride two up with an appropriately loaded Givi top trunk. My FJR is a 2007. Sold my 2005 Concours after 40,000 miles of touring.
Is this a frequesnt issue?
Is there an economical way to reinforce this area?
Should I just load 'er up and take my chances?
Looking for some feedback from those who tour with a top trunk (or not).
P.S. No regrets with the FJR - love the rides I've had so far. The bike fits me well.
Thanks !
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post #2 of 70 (permalink) Old 01-08-2019, 02:19 PM
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Haven't seen that many failures maybe 10 in as many years, im sure someone makes a strengthener for the are that can crack.

Someone will be along with first hand knowledge of the conditions that cause them to fail hopefully.

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post #3 of 70 (permalink) Old 01-08-2019, 03:17 PM
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Yes, subframe failures are a frequent issue when using Top Boxes. However, if you are using the correct GIVI SR357 mounting rack with your Givi Top Box, then this should be sufficient to re-enforce your subframe. I would still recommend that you use the smallest Top Box available. There are 3 main causes of subframe failure, these are high speed riding, which causes high wind loading on the box. Excessive weight in the Box, and riding on rough roads.
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post #4 of 70 (permalink) Old 01-08-2019, 05:07 PM
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I’ve got 90,000 miles on bigass topcases, often carrying lots of stuff, often heavy, and often (as a backrest) supporting my wife through spirited acceleration after spirited acceleration. All on FJRs. All with SR357’s. I’m not sure you can crack a subframe with an sr357 installed. I’ve sure tried. At no speed do large top boxes cause untoward handling or undue case drag at speed on the two FJR’s I’ve owned. I mean at FJR nominal speeds. DAMHIK. I’ve ridden rough roads, but not too many total **** roads. I’m willing to bet that Bernie has seen a lot rougher roads than I have, for a lot more miles.
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post #5 of 70 (permalink) Old 01-08-2019, 05:19 PM
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Here may or may not be some useful information for you, aluminum suffers from dress cracking, and you can either do one of two things, replace the sub frame with a steel one or remove the subframe and stress relief the existing one by heating to 220c at least once a year, I would go with replacing with a steel one if I had a failure
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post #6 of 70 (permalink) Old 01-08-2019, 05:29 PM
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If you donít want to run an sr357, garauld techworks stiffy kit is the best reinforcement available. If you wish to run a stock Yamaha box, they have a fairly recent fully aluminum rack to replace your painted plastic one.
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Haven't seen that many failures maybe 10 in as many years, im sure someone makes a strengthener for the are that can crack.

Someone will be along with first hand knowledge of the conditions that cause them to fail hopefully.
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post #7 of 70 (permalink) Old 01-08-2019, 05:49 PM
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Originally Posted by Alan smithy View Post
Here may or may not be some useful information for you, aluminum suffers from dress cracking, and you can either do one of two things, replace the sub frame with a steel one or remove the subframe and stress relief the existing one by heating to 220c at least once a year, I would go with replacing with a steel one if I had a failure
Is there a replacement subframe available on the market that is made of steel?

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post #8 of 70 (permalink) Old 01-08-2019, 09:30 PM
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Is there a replacement subframe available on the market that is made of steel?
Not that I have ever heard of, it's a very intricate design.

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post #9 of 70 (permalink) Old 01-08-2019, 09:56 PM
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One member here replaced his. It took him about 2 1/2 days. Practically everything above the swing arm and behind the rear shock including the ABS bolts to it.
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post #10 of 70 (permalink) Old 01-08-2019, 10:21 PM
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Is there a replacement subframe available on the market that is made of steel?
I don't know of any either. I have rewelded a couple so I know it can be done successfully. I added some additional reinforcement ribs when I did them.

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