Stiffening subframe

When an XR650R rear subframe breaks :D , WHERE DOES IT BREAK?

I want to stiffen the reportedly weak subframe and want to know what areas to pay attention to :D .

Eduardo

’03 XR650R

My sub was bent when the original owner picked it up from the dealer; it took him a long time to notice and by then it was out of warranty. I guess it's very common. He used a long 2X4 thru it as a prybar, and it cracked slightly at the left upper mount. I haven't gotten around to welding it up yet, but I will be adding gussets to the upper and lower mountings to spread the load a bit.

Mine came with the "factory bend" option as well and I made it worse after and endo with a twist and a bad landing (the whole rear twisted 1.5" to the left) a calibrated 2X4 and some :D fixed it.

Now I hear that the frame has been known to crack at some points and I want to stiffen it while I have out. (welding some aluminum along bad spots.

Eduardo.

go to srcinc.net

I gussetted mine where the rails met...then i added an extra cross-member.

Its stiff!

Cost me $20 at Welding Works in Orange, Ca.---he does the same for factory desert bikes...

I gussetted mine where the rails met...then i added an extra cross-member.

Its stiff!

Cost me $20 at Welding Works in Orange, Ca.---he does the same for factory desert bikes...

:D

Where did you put the cross member? Maybe behind the bracket that has the seat mounting threaded holes?

Eduardo

XR650R

The SRC kit strengthens the rear fender but adds additional leverage to the subframe which will increase the likelyhood of its eventual breakage, especially if you add a rack/panniers. The DK version of the XR-650R has a fender brace somewhat similar to the SRC unit stock (used to support the taillight/turn signals). It likely can be special ordered and is a good fit and well made. Like the SRC unit it does not add extra support to the subframe itself. Gusseting the stock unit is the only solution for a stronger subframe that I can think of. I am running dirtbagz and a rear cargo bag with BD passenger footpegs, all mounted to the subframe. For street use it has proven strong enough but I would hesitate to go anywhere rough with a passenger or cargo loaded until I eventually mod the subframe to make it stronger.

I have both the strengthened sub-frame AND the SRC.net subframe extender, with Baja Designs LED license plate holder--AND a custom bracket on top of the fender for my GPS antennae, dual running lights, Sentinal bracket, etc.

Works great!

I put the extra sub-frame cross member right next the the existing one--shaving a bit so it cleared everything.

I can pick up the bike by the rear fender now without issues.

I've tried other set ups--but for me they just couldnt take it. Either the license plate/brake light loosened up, or broke, or the sub-frame would bend.

The SRC.net set up is very sano/beefy. That and a gusseted sub-frame is a nice way to go. Add in the BD LED brake light and things are good. The SRC unit has little holes for mini-turn signals that are also nice.

Irondude, did you do anything to strengthen the mounting locations for the subframe? That seems like it is the area of most concern.

Please post pictures of your subframe solutions. Thanks.

Is this for xr650 s only or as well a problem for xr600r ?

Any pics....fellas? Irondude can we see that rear shot of your 650R again??

we need pics, please

Is this for xr650 s only or as well a problem for xr600r ?

Well ??? does the xr 600r have a week spot for cracking too ?

Well ??? does the xr 600r have a week spot for cracking too ?

I've heard of a few guys having problems around the steering stem area but I never had any with my 600. I'm not much of a jumper.

I'm 300lbs ish & I'll keep my eye on sterring head. Thanks !!!

Hi. I am wanting to stiffen my subframe to be able to mount panniers and less

importantly carry a passenger. I would like to know what type of welding rod

to use for tig welding. I have 4043 and 5356 filler rod. Any suggestions? MM

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