Any one know reason for this crush - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 6 (permalink) Unread 10-10-2019, 11:37 AM Thread Starter
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Any one know reason for this crush

What happen for this crush
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post #2 of 6 (permalink) Unread 10-10-2019, 12:46 PM
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Carrying stuff in a top case on tail. Reason why the sr357 should be used when there is a top case on tail.
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Current Bike> '14 FJR ES, '17 Versys-X 300 ABS
Past Bikes > '09 Ninja 250r, '00 XT225 (blew piston), '03 Goldwing, '07 DR650, '07 XT225, '12 NC700x
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post #3 of 6 (permalink) Unread Yesterday, 01:40 AM
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yea, what he said.

Or possibly, it could be because your aftermarket mufflers are too loud. What usually happens is, loud mufflers tend to cause a harmonic imbalance that transmits itself up through the frame, into the seat, and up the spine, causing the rider to involuntarily react with reckless abandon which only exacerbates the problem as he or she twists the throttle even harder. The unfortunate result is further harmonic imbalance which extends outside of your bike and into the startled ears of some guy in the parking lot that kicks your bike over.
hee hee

-Steve in Phx
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2007 FJR1300AE
2000 Honda XR650L (bought new)

...and a bunch of other dirt bikes
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post #4 of 6 (permalink) Unread Yesterday, 07:02 AM
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Quote:
Originally Posted by Sabek Sabek View Post
What happen for this crush
Sabek,

First, welcome to the forum. Sorry your first post has to be about the subframe issue. Subframe failure is a well covered topic, usually related to adding a topbox. Try searching for "subframe" in the Google custom search in the upper right of the forum pages. Many posts will come up about it.

The general consensus is that if you are using a topbox, something has to be done to increase the strength of the subframe where the box attaches and can cause flexing at the point you experienced a failure.

The popular ways this can be done is by using the Givi SR357, the Yamaha aluminum grab bar/rack 1MC-F48D0-V0-00, or adding a stiffy kit made by forum member Garauld, https://www.fjrowners.com/forums/24-...y-catalog.html. There are lots of other lesser known fixes that you can find if searching "subframe".

Unfortunately, since you already have damage, you will have to start with replacing or repairing the factory subframe.

'14 FJR1300ES
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post #5 of 6 (permalink) Unread Yesterday, 08:22 PM
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Hi Sabek, you have suffered a typical case of aluminum work hardening, this courses cracking in the metal and eventually brakes. The cause of the problem is when the subframe was made it had not been stress relieved.
The fix is easy remove the broken subframe, get a qualified welder to repair and reinforce the subframe, and then ask the to stress relief the whole thing.
This is your cheapest and quickest option, and you should not have this problem ever again, but a word of caution try not to overload the top box , keep it under 10kg, or 20 lbs.
Let me know how you got on with that little fix, Alan.
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post #6 of 6 (permalink) Unread Today, 07:34 AM
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Givi 357/Shad tube rack or the Yamaha heavy aluminum rack are the only things that will help prevent that. Yamaha recommends a max of 10/11lbs max over the weight of the top box, no more.

As you probably already know a new subframe is $600+ ,,,, depending on what year you have (you don’t list the year or location, highly Recommended) you might call Yamaha and ask them about it and MAYBE they’ll give you a discount on a new one. Myself if they won’t help you out on a new one I would heavily reinforce your current subframe. They are very thin cast aluminum and when mine broke I found it to be .060-.090in thick in most places, very thin. Also anything you can do to reduce or eliminate the flex of the tab at the very rear of the top portion of the frame that everything bolts to will help as it is the lever that creates the flex that flex’s & breaks the lower subframe by transferring the flex of the tab through the struts between the upper and lower portion of the frame.

You didn’t post what topbox or backrest you were using and any adapter mounts. Keeping the tab from flexing is the key to not breaking things, by the way I used a “stiffy” when mine broke, well made piece but does nothing to keep the tab from flexing but when it does break the stiffy will keep your parts from littering the highway behind you but will not prevent the subframe from breaking.

Steve P
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