HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
Barro

Stiffening subframe

17 posts in this topic

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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...

Share this post


Link to post
Share on other sites
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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites
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 ?

Share this post


Link to post
Share on other sites
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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0