2011 YZ450 breaking subframes

[nedted]

I've broke two subframes on my 2011 yz450 within 20-30 hours of each other, and they both broke in the same place (in between the exhaust mount holes where the fender bolts on) and I was wondering if anyone else has had this problem and how to fix it. Below are some pictures of the subframe.

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[phiderman]

I cut the end off and made a new price out of steel and then riveted it into place. No problems since.

[phiderman]

Here is a picture

[cattledog924]

I have broken the subframe on my 2010 multiple times, twice in that same spot. I found a good welder, which is cheaper than a new frame. It has really pissed me off.

[nedted]

I cut the end off and made a new price out of steel and then riveted it into place. No problems since.

Thanks. I'm gonna try to fix it like this. I'll post some pics when I'm done.

[nedted]

I have broken the subframe on my 2010 multiple times, twice in that same spot. I found a good welder, which is cheaper than a new frame. It has really pissed me off.

The first time I broke my subframe I brought it to a welder and they welded it for $20 but it only lasted one ride before it broke again.

[kxboi704]

quit casing jumps bud

[cattledog924]

[DC_Excitement]

are they breaking with stock or aftermarket exhaust?

[nedted]

are they breaking with stock or aftermarket exhaust?

I have a yoshimura full system on my bike.

[nedted]

[Norton218]

my 12' broke in the same place to.all so with a yosh slip on system.I now one guy that has a Dr.D system on his 12' and he has had no problems

[DC_Excitement]

I asked the question because it may be an aftermarket exhaust issue more than a Yamaha problem. I have the stock exhaust and hammer on the bike with a lot of bottom outs and its just fine.

 

maybe there is too much weight on that one mount?

[asnyder2]

Hope that its not related to having yoshi exhaust...I just got one recently

[Aflo16]

I just did this with my '11.  broke the subframe in the exact same spot.  I have previously had rub marks on my exhaust (FMF F4.1) so I know I was impinging.  When I finally had failure, it was a first ride on a new rear tire.  I had switched from a Pirelli Scorpion 120 rear to a Maxxiss Maxxcross IT 120 rear.  Did any of you have rubbing?  What tire/exhaust combo did you run?  Thanks.

[cpetz24]

Checking mine tonight.  I've got the stock exhaust though.  Common theme from above is that everyone has had an aftermarket exhaust.  Yoshi mainly.  Coincidental?  Maybe, but seems fishy. 

[F0Xryder61]

50+ hours on mine with a full fmf 4.1 (i think) on mine. No problems so far...

[Aflo16]

I bit the bullet and bought a new subframe (albeit aftermarket).  I just finished undrowning my brother in law's quad so my bike is next up for reparis.  Going to take the subframe off and pop the new one on.  Then I think I'm going to spin up a spacer on my lathe to hold the exhaust a bit further out.  I haven't looked at it in detail yet so I am not even sure if there is room to space the exhaust out further but if there is... I'm going to have a new subframe and a newly made part that might solve this problem once and for all.  And for anyone that has not yet blew their frame off the back of their bike with their rear tire... it might be worth taking the extra step in preventative maintenence to rig up a space.  If sucessful - I'll post a pic or two.

 

Thanks for the info guys...and I agree - seems to be related to aftermarket pipes.  Still not going back to stock tho.... ?

[mikedabike]

I know yosh revised thr mounting on thier pipes sometime after the 10 came out.