I'm running a stock MC18 rad. It works even in the heat of Thailand, except stuck in Bangkok traffic. Hubble bubble toil and trouble etc.

I have a small ( 90mm/3.5") fan from a Honda Sonic and will be fitting a second. Switch on in traffic switch off above about 65 kph.

Might bung in some Motul radiator additive for good measure?
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If the rats eat my wiring one more time....