If you're like me you've ridden enough to tweak your radiator a time of two. When I first got into this sport I would just simply replace it if it started leaking. Over time I learned a few tricks to save a few $$$. Sometimes it can be straightened if left secured to the bike. The mounting bolts can act as a vise. Next get yourself a pair of channel-locks or large vise-grips and attempt to pull out the area bent. Sometimes if it's just twisted, you can (easier when still hot), using a pair of gloves, twist it back straight. The leaking will usually occur at the junction of the core and tanks. I have found that using JB weld will usually stop any and all leaks the first time. It takes some patience, to allow to fully cure. But it's worth saving $75-$100 each radiator. The JB weld is self-leveling and should be used on one side then turned upside down after a few hours or drying if the other side needs attention. Oh, I almost forgot to mention. I test the radiator for leaks by filling with water, plugging the holes with rubber plugs, and taping with duct tape. I use one plug drilled through with a small hole for which to insert the nozzle of my compressor valve. I will test it at around 40PSI cold. That's usually enough to mimic operating stress under extreme heat. Look for the water and proceed accordingly. However, I have found it easier to simply use JB weld to cover the entire base area, top and bottom, where the core enters the tanks. Not too much, just enough to cover the base area and extend slightly up the fins of the core to get a good seal. Good luck. Hope this helps.