Don I feel your pain buddy.
My 220k mile radiator sprung leaks during my last big ride a few weeks back, as luck would have it it was only 1/3 through the ride so I managed to ride another 2k miles, feeding her regular doses of black pepper
If you think burnt coolant is bad, you should try it with baked black pepper
For me in Japan, it's even more expensive (as everything is here) to buy an OEM radiator, so I was literally one click away from pulling the trigger on that exact unit from ASI-Pro. I count myself extremely lucky that I decided to Google this Chinese POS product and find some reviews, albeit for cars where people were complaining about numerous issues. Given what a PITA the radiator swap is on the FJR I figured I had little choice but to bend over and order the OEM. It too about 3 weeks to get, even though the factory is in Hamamatsu, Japan (about 4 hours away). It was on back-order, apparently there's not a such a high demand for them.
When I was installing the new engine I checked the radiator and cleaned it out and flushed it thoroughly, it looked used but had never leaked, I wish I'd dropped the coin then and saved myself some extra work now. The only explanation I can think of is that the new (10k mile) engine pressurizes the cooling system much better than the old worn out engine did.
My failure was also in two places, the radiator was suffering from a cascade of pinprick leaks, with new ones appearing once the pepper had sealed up the old ones. My Thermostat housing also leaked around the same time (only about 4k miles with the new engine). The housing looked fine from an external visual inspection, but corrosion had eaten through the side of the aluminum housing from the inside.
Last week I finally received all the parts and installed the new OEM radiator, along with low mileage thermostat housing (I replaced the hoses during the engine swap) and new low-mileage fans.
New OEM radiator, and low-mileage fans ready for the install
My fans both still work and move freely, but one was getting a bit noisy, or so I thought, it was only once I'd hooked up the new low-mileage fans that I realized just how noisy both of my old fans really were and hence that they likely were not long for this world. My point here is unless your fans are relatively new (replaced after the deer strike) maybe you should consider sourcing some low-mileage replacements off eBay, you can find them for around $40-50 a piece or lower, new OEMs are around $230 each... Since the fan swap job involves a full radiator removal.