Welcome to the site !!
They make heavy duty Chain Guides , but the mounting on the swingarm , is what it is , i guess you could take it to a welder (take the swingarm off the bike , don't weld on the complete bike or it usually fries the electronics) and get the mounts gusseted , don't forget to take a guide with you so you know where everything sits , so there is no issue installing it after any welding is done
Bulletproof Designs made a kit for the KTM , some people were adapting it to the CRFX , but its been a few years (2008) , so who knows if its still available or if anything was made specifically for the CRF
(pictures of the brace on the second to last post on the first page *this is from 2008*)
http://www.crfsonly.com/forum/viewtopic ... rm+bracing
I just read the rest of the topic(page 3 in the link in the above paragraph) , it seems this is available here(not the welded on brace , but its supposed to strengthen it)
http://www.crfsonly.com/catalog/product ... ts_id/3370
What is happening that is causing it to break/bend ?? , i have heard of people occasionally breaking or bending them , but its usually rare (slamming down on a rock at speed) , i have never had a issue myself and ride in some pretty sketchy places ....a little more info on what is happening might solve , or at least help with solving why its bending/breaking