FWIW my KLX250 subframe looked just like that. Bikes and parts here in Malaysia are big bucks but welding is good and cheap. They ended up taking about 3" of rolled steel that was slightly larger inner diameter than the subframe and grinding it down till it just barely fit and welded it back with that reinforcement in the center. Then they added cantilever type flat pieces of steel under the frame. I've almost always got a heavy Givi box on the back of my bike and that weld job held up for thousands of miles. Going thru Thailand, Myanmar, Laos on a 6K KM trip that was at least 25% washboardy type off road I weighed the box and it was 17 kg or 37 lbs! My guess is at most it only added 3 lbs to the subframe... probably less.